An opportunity for a key man? (7)
I believe the answer is:
opening
'an opportunity' is the definition.
(opening is a kind of opportunity)
'a key man?' is the wordplay.
I cannot quite see how this works, but
'key' could be 'g' (I've seen this in other clues) and 'g' is found within the answer.
'man?' could be 'pen' and 'pen' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for opening that I've seen before include "Aperture or opportunity" , "First -- beginning" , "Opportunity, start" , "Kicking off" , "Vacancy" .)