Coin occupying hole (6)
I believe the answer is:
invent
'coin' is the definition.
(I've seen this before)
'occupying hole' is the wordplay.
'occupying' becomes 'in' (I've seen this in other clues).
'hole' becomes 'vent' (vent is a kind of hole**).
'in'+'vent'='INVENT'
(Other definitions for invent that I've seen before include "Discover Devise, concoct" , "Cook up" , "Create like Edison" , "Make up (something false)" , "Coin" .)