An opening for an opener (7)
I believe the answer is:
keyhole
'an opening for an opener' is the definition.
I can't tell whether this definition defines the answer.
'opening for an opener' is the wordplay.
'opening' becomes 'hole' (hole is a kind of opening).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'an opener' becomes 'key' (keys open things).
'hole' put after 'key' is 'KEYHOLE'.
Can you help me to learn more?
(Other definitions for keyhole that I've seen before include "Opening in door - kind of surgery" , "Aperture for lock opening" , "Opening for the opener" , "may cover a number of wards" , "Aperture in lock - kind of surgery" .)