Finish on a high, picking up answer, sort of (2,1,7)

'sort of' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'finish on a high picking up answer' is the wordplay.
I cannot quite see how this works, but
'on' is within the answer.
'a' is found in the answer.
'answer' could be 'a' (abbreviation eg in Q and A) and 'a' is found within the answer.
an anagram of 'finish' is 'infshi' which is present in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?