Some decoy put out for rodent (5)
I believe the answer is:
coypu
'rodent' is the definition.
(I know that coypu is a type of rodent)
'some decoy put out' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'COYPU' is hidden within 'decoy put out'.
'for' acts as a link.
(Other definitions for coypu that I've seen before include "Aquatic beaver-like rodent" , "aquatic mammal" , "South American beaver-like beast" , "Beaver lookalike" , "Large South American aquatic rodent" .)