Animal trap I set (5)
I believe the answer is:
tapir
'animal' is the definition.
(tapir is a type of animal)
'trap i set' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'trap'+'i'='trapi'
'trapi' with letters rearranged gives 'TAPIR'.
(Other definitions for tapir that I've seen before include "I part with the pig-like animal" , "creature" , "Long-nosed, hoofed mammal" , "Tropical hoofed mammal with a flexible proboscis" , "Hoofed mammal; I trap (anag.)" .)