Reel holder (3)
I believe the answer is:
rod
'reel holder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rod that I've seen before include "Spare it and spoil the child, they used to say" , "Measurement" , "Straight, slender stick" , "The fly fisherman's stick" , "Cane used for flogging" .)