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Open conversation with most of 1 across and half the town in 13 across

Ross

I believe the answer is:

heart-to-heart

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'open' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for heart-to-heart that I've seen before include "Intimate talk" , "Candid conversation" , "Intimate conversation" .)

I've seen this clue in the Irish Times.
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