Dog track's mine (8)

I believe the answer is:

colliery

'mine' is the definition.
(I've seen this before)

'dog track's' is the wordplay.
'dog' becomes 'collie' (collie is a kind of dog).
'track' becomes 'RY' (abbreviation for railway).
'collie'+'ry'='COLLIERY'

(Other definitions for colliery that I've seen before include "Where a coalminer goes to work" , "Coal-mining establishment" , "Coal mine" , "Mining complex" , "Pit" .)

I've seen this clue in The Times.

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