Bring up (a subject) (6)
I believe the answer is:
broach
'bring up a subject' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for broach that I've seen before include "Raise (a subject) for discussion" , "Open (container, subject)" , "Hint" , "Bring up or mention a subject" , "Start to talk about" .)