Take off a long narrow piece (5)
I believe the answer is:
strip
'narrow piece' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for strip that I've seen before include "Dismantle" , "Remove clothes, just a sliver" , "footballers' outfit" , "Band; unclothe" , "Series of cartoon pictures - undress salaciously" .)