Mouse-like rodent (4)
I believe the answer is:
vole
'mouse-like rodent' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for vole that I've seen before include "River-bank rodent" , "A little rodent" , "win all the tricks" , "Strange love for a rodent" , "Small burrowing animal - love it" .)