Last attempt to borrow that really capped everything (3,9,5)
I believe the answer is:
the finishing touch
'borrow that really capped everything' is the definition.
I know nothing about this answer so I can't tell whether this works.
'last attempt to' is the wordplay.
I cannot really see how this works, but
'last' could be 'finish' (synonyms) and 'finish' is located in the answer.
'to' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
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