Boffin, one enthralled by exotic insect in street? (9)
I believe the answer is:
scientist
'boffin' is the definition.
(I've seen this before)
'one enthralled by exotic insect in street?' is the wordplay.
'one' becomes 'i' (Roman numeral).
'enthralled by' is an insertion indicator ('enthral' can mean 'capture').
'exotic insect in' becomes 'scient' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'street?' becomes 'st' (abbreviation).
'scient'+'st'='scientst'
'i' going inside 'scientst' is 'SCIENTIST'.
Can you help me to learn more?
(Other definitions for scientist that I've seen before include "Researcher - boffin" , "Eg, a chemist" , "entomologist maybe" , "It's nicest for one engaged in specialist studies" , "`Tis nicest kind of specialist" .)