Workshop grippers (6)
I believe the answer is:
clamps
'workshop grippers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clamps that I've seen before include "Holds tightly with device - illegally parked cars? (6)" , "Grips" , "Devices to hold things firmly, car-wheels say" , "Device to hold things, car wheels say" , "fasteners" .)