Crossword Genius

Coal miner's dog? (6)

Ross

I believe the answer is:

collie

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

This clue might be a double definition.

'coal miner's' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

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

Can you help me to learn more?

(Other definitions for collie that I've seen before include "Sheepdog wth ling nose and shaggy hair" , "Popular kind of sheepdog" , "shepherd's gofer" , "Breed of sheepdog" , "Sheep-herding dog" .)

I've seen this clue in the Evening Standard.
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