Crossword Genius

Sheep dog almost as big as a miner (6)

Ross

I believe the answer is:

collie

I'm a little stuck... Click here to teach me more about this clue!

'sheep dog' is the definition.
(collie is a kind of sheep dog)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for collie that I've seen before include "Sheepdog with long pointed muzzle" , "Border dog" , "Breed of dog" , "Farm dog" , "Popular sheepdog like Lassie" .)

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