Crossword Genius

Dog right for an underground worker (7)

Ross

I believe the answer is:

collier

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

'an underground worker' is the definition.
'collier' can be an answer for 'worker' (collier is a kind of worker). I am not sure about the 'an underground' bit.

'dog right for' is the wordplay.
'dog' becomes 'collie' (collie is a kind of dog).
'right for' becomes 'r' (I've seen this in other clues).
'collie'+'r'='COLLIER'

Can you help me to learn more?

(Other definitions for collier that I've seen before include "He works in a coal mine" , "Ship carrying coal" , "unable to avoid contact with mine" , "Pitman" , "Miner; coal ship" .)

I've seen this clue in The Mirror.
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