Criticism for dangerous flying? (4)
I believe the answer is:
flak
'criticism' is the definition.
(flak is a kind of criticism)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for flak that I've seen before include "Severe criticism" , "complaints" , "Criticism (colloq.)" , "Shooting" , "Anti-aircraft fire - strong criticism" .)