Chinese Zodiac animal (3)
I believe the answer is:
rat
'chinese zodiac animal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rat that I've seen before include "Domestic rodent" , "one not going down with ship" , "Scumbag" , "Betray like a rodent" , "Renegade" .)