Stick of chocolate with end bitten off (4)
I believe the answer is:
flak
'stick' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for flak that I've seen before include "Shooting" , "Anti-aircraft fire - strong criticism" , "that can bring down a plane" , "heated disagreement" , "Ground-to-air attack: verbal abuse" .)