Rod's companion (4)
I believe the answer is:
reel
'rod's companion' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reel that I've seen before include "Film spool" , "Stagger around in the dance" , "A merry dance or an angler's winder" , "Winding spool on a fishing rod" , "Turn around in the dance" .)