Clove hitch or sheepshank (4)
I believe the answer is:
knot
I believe this clue is a double definition.
'clove hitch' is the first definition.
(I know that clove hitch is a knot)
'sheepshank' is the second definition.
(I've seen this in another clue)
(Other definitions for knot that I've seen before include "To secure < > bird" , "Something tied" , "Small sandpiper - speed at sea - hitch" , "Entwine" , "Ring < sandpiper" .)