A char, say, may react to an enticement (4,2,3,4)
I believe the answer is:
rise to the bait
I believe this clue is a double definition.
'a char say may' is the first definition.
(char is a type of fish)
'react to an enticement' is the second definition.
(to react to something enticing)
(Other definitions for rise to the bait that I've seen before include "Take the lure" , "React to provocation as intended" , "Do what someone else suggests" , "Act because of someone's suggestion" , "do what someone else intends" .)