A long piece can still be comic (5)
I believe the answer is:
strip
This clue might be a double definition.
'a long piece' is the first definition.
(long strip of material)
'can still be comic' is the second definition.
'strip' can be an answer for 'can' (thesaurus). I am not certain of the 'still be comic' bit.
Can you help me to learn more?
(Other definitions for strip that I've seen before include "Kind of lighting" , "Undress completely" , "Set of football clothes" , "Take off clothing" , "sports outfit" .)