Sailing pole of various parts (4)
I believe the answer is:
spar
'sailing pole' is the definition.
'of various parts' is the wordplay.
'of' indicates a hidden word.
'SPAR' is hidden in the letters of 'various parts'.
(Other definitions for spar that I've seen before include "Raps with large beam" , "Mineral; strong pole" , "Act as boxer" , "Rafter, boom" , "supporting member" .)