Firm peak, it is mine (7)
I believe the answer is:
coalpit
'is mine' is the definition.
(I've seen this before)
'firm peak it' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'peak' becomes 'alp ' (I've seen this before).
'co'+'alp'+'it'='COALPIT'
(Another definition for coalpit that I've seen is " mine".)
I've seen this clue in The Guardian.
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