Lure starts to bob and intrigue tench (4)
I believe the answer is:
bait
'lure' is the definition.
('bait' can be a synonym of 'lure')
'starts to bob and intrigue tench' is the wordplay.
'starts to' indicates taking the first letters.
The initial letters of 'bob and intrigue tench' is 'BAIT'.
(Other definitions for bait that I've seen before include "Deliberately annoy or taunt" , "Set a trap with food" , "Enticement for fish" , "Allurement" , "Food used as lure" .)