Section about a lure (4)
I believe the answer is:
bait
'lure' is the definition.
('bait' can be a synonym of 'lure')
'section about a' is the wordplay.
'section' becomes 'bit' (I've seen this in other clues).
'about' is an insertion indicator.
'bit' enclosing 'a' is 'BAIT'.
(Other definitions for bait that I've seen before include "Deliberately annoy or taunt" , "Enticement, lure" , "Boilie, for example" , "Set a trap with food" , "Food on a hook to attract fish" .)