Barrel strip (5)
I believe the answer is:
stave
'barrel strip' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stave that I've seen before include "Delay before off" , "Stanza of a poem" , "System of five horizontal lines in written music" , "Musical staff" , "Set of lines on which musical notes are written" .)