If puncture occurs, men will find air pump (8)
I believe the answer is:
inflator
'air pump' is the definition.
(I've seen this before)
'if puncture occurs men' is the wordplay.
I cannot quite understand how this works, but
'puncture' could be 'flat' (I've seen this before) and 'flat' is present in the answer.
'men' could be 'or' (military abbreviation for Other Ranks) and 'or' is present in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'will find' is the link.
Can you help me to learn more?
(Other definitions for inflator that I've seen before include "Air pump" , "Balloon filler" .)