Mouselike mammal (5)
I believe the answer is:
shrew
'mouselike mammal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shrew that I've seen before include "Insectivore - Katharina" , "Woman to be tamed?" , "Harridan" , "Long-nosed mammal" , "Little mammal; a scold" .)