Hall's music partner (5)
I believe the answer is:
oates
'hall's music partner' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oates that I've seen before include "sacrifice" , "Popish Plot perjurer" , "Captain -, polar explorer with Scott" , "Polar explorer - Stuart conspirator" , "South Pole hero; Popish Plotter" .)