Open up a discussion about another topic; “Alternative way of spelling Bharuch” (6)

I believe the answer is:

broach

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'open up' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for broach that I've seen before include "Bring up or mention a subject" , "Start to talk about" , "Open (container, subject)" , "Raise (a sensitive subject)" , "Pierce (a cask)" .)

I've seen this clue in The Hindu.

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