Engage in woolgathering? (5)
I believe the answer is:
'engage in woolgathering?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shear that I've seen before include "Remove sheep's wool" , "shave" , "Clip a sheep" , "Cut with clippers" , "Cut the wool of 14 across" .)