Chews a cigarette end in pieces! (5)
I believe the answer is:
bites
'chews' is the definition.
(I've seen this in another clue)
'a cigarette end in pieces' is the wordplay.
'a cigarette end' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
'pieces' becomes 'bits' (bit is a kind of piece).
'e' put into 'bits' is 'BITES'.
Can you help me to learn more?
(Other definitions for bites that I've seen before include "Nips to" , "Tears with the teeth" , "Mouthfuls" , "Stings" , "Morsels" .)