Let's turn crossword puzzles into a forum game!

One person will a clue and the number of letters in the answer, and then the next person will answer the clue and then give their own clue (making sure that the answer to their clue would "cross" with the previous answer by sharing one of the letters).

For example:

Person 1: A member of the Equidae family, 6 letters.

Person 2: donkey; The boy who lived, 11 letters.

Person 3; harrYpotter; The mother of dragons, 8 letters.

Person 4: khAleesi; clue, # letters.

Etc. 

I'll start!

CLUE: A horse's father, 4 letters.

rabbit

a shape that is related to the circle, 4 letters

oval

an unknown in a math problem; a tendancy to change. 8 letters

variable

red fruit, prevalent in Greek mythology. 11 letter

pomegranate

a final resting place; 5 letters

Grave! 

A draft breed ; 8 letters 

I feel like there could be more than 1 answer here but the first one I thought of was Ardennes!

Not light; 4 letters

I was going for Friesian s!  LOL But Ards work too! 

Dark! 

The Mascot of Thanksgiving aka what we all will be eating soon ; 6 letters ! 

turkey!

where you would listen to live music; 7 letters

concert!

raiding/farming culture from norway, sweden, and denmark (plural); 7 letters

vikings?

one of the four seasons, usually with new life; 6 letters

spring

a green nut and ice cream flavor of the same color; 9 letters 

Pistachio

reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate; 10 letters

chalkboard ^good one, chime!

an animal, mammal, usually found on the side of the road, with an armored covering and long tail; 9 letters

armadillo

a piece of machinery that gets people from one location to another; 10 letters

locomotive?

a type of pattern found either on cloth (and very popular during 1800s) or as an animal pattern, usually on cats (and can be used to describe the breed of cat); 6 letters

calico?

a large, heavy motor vehicle used for transporting goods, materials, or troops; 5 letters

truck

a type of fish, often decorative, yet real, that inhabits small man-made ponds; 3 letters

koi

a large, common, usually gray and white bird that lives near the ocean; 7 letters 

Seagull

A type of adhesive, 4 letters

tape? or glue, I suppose

the seed-bearing part of a plant, consisting of reproductive organs (stamens and carpels) that are typically surrounded by a brightly colored corolla (petals) and a green calyx (sepals); 6 letters