Love to upset mouse-like thing (4)
I believe the answer is:
vole
'mouse-like thing' is the definition.
I can't judge whether this defines the answer.
'love to upset' is the wordplay.
'to upset' indicates anagramming the letters.
'love' is an anagram of 'VOLE'.
Can you help me to learn more?
(Other definitions for vole that I've seen before include "A little rodent" , "Small mouse-like rodent" , "Holm-oak" , "creature" , "A small plant-eating rodent - love it" .)