Traps set for little fish (5)
I believe the answer is:
sprat
'little fish' is the definition.
(I've seen this before)
'traps set' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'traps' with letters rearranged gives 'SPRAT'.
'for' acts as a link.
(Other definitions for sprat that I've seen before include "one on a fat-free diet" , "'Set a . . . . . to catch a herring'" , "Mackerel bait?" , "Tiny fish" , "Small edible fish" .)