Brush partner (4)
I believe the answer is:
comb
'brush partner' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for comb that I've seen before include "Fastening spikes" , "Disentangle" , "Groom the tresses" , "Crest on the head of some birds" , "business storage unit" .)