A canvas sheet could make you hesitate! (3)
I believe the answer is:
Here is my best explanation:
This clue could be a double definition.
'a canvas' is the first definition.
(jib is a kind of canvas)
'hesitate' is the second definition.
'sheet could make you' is the link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
(Other definitions for jib that I've seen before include "Foresail", "Crane's arm", "Baulk" and "Projecting arm of crane".)