Termagant (5)
I believe the answer is:
shrew
'termagant' is the definition.
(I know that termagant can be written as shrew)
This is the entire clue.
(Other definitions for shrew that I've seen before include "Scold; insectivore" , "Small insectivore" , "Virago" , "Little mammal; a scold" , "Petruchio tamed one" .)