Pole is nuts (4)
I believe the answer is:
mast
I believe this clue is a double definition.
'pole' is the first definition.
(mast is a kind of pole)
'is nuts' is the second definition.
(mast is the nuts of forest trees)
(Other definitions for mast that I've seen before include "Sail carrier" , "Spar to support a sail" , "Tall pole from which flag is flown" , "nuts and seeds" , "Long vertical pole" .)