Call a good worker a shrew? (9)
I believe the answer is:
termagant
'a shrew?' is the definition.
('termagant' can be a synonym of 'shrew')
'call a good worker' is the wordplay.
'call' becomes 'term' (terming is a kind of calling**).
'a good' becomes 'ag' (I've seen this in other clues).
'worker' becomes 'ant' (worker is a type of ant).
'term'+'ag'+'ant'='TERMAGANT'
(Other definitions for termagant that I've seen before include "Shrew, scold" , "Nagging woman" , "dragon" , "she scolds" , "battleaxe" .)