Rabbitlike rodent (6)
I believe the answer is:
agouti
'rabbitlike rodent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agouti that I've seen before include "S. American burrowing rodent" , "South American rodent" , "Caribbean rodent" , "Rabbit-sized rodent of South America valued as food" , "Large rodent" .)