Precisely identify purpose of personal identification number? (8)
I believe the answer is:
pinpoint
'precisely identify' is the definition.
'pinpoint' can be an answer for 'identify' (thesaurus). I am not sure about the 'precisely' bit.
'purpose of personal identification number?' is the wordplay.
I cannot quite understand how this works, but
'purpose' could be 'point' (I've seen this before) and 'point' is present in the answer.
'number?' could be 'pin' (I've seen this before) and 'pin' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pinpoint that I've seen before include "Tiny dot; locate exactly" , "something sharp" , "Precisely indicate" , "Define precisely" , "Put one's finger on" .)