Name a good insect for shrew (9)
I believe the answer is:
termagant
'for shrew' is the definition.
(synonyms)
'name a good insect' is the wordplay.
'name' becomes 'term' (both can mean a word for something).
'good' becomes 'g' (abbreviation).
'insect' becomes 'ant' (ant is a kind of insect).
'term'+'a'+'g'+'ant'='TERMAGANT'
(Other definitions for termagant that I've seen before include "TT manager is an overbearing woman" , "Harsh-tempered woman" , "Awful female" , "Woman to avoid" , "Shrew, scold" .)