Sharp criticism (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
flak
'sharp criticism' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flak that I've seen before include "complaints" , "Anti-aircraft shells or adverse criticism" , "stick" , "heated disagreement" , "Severe criticism" .)