One who shuts up and gets more intimate? (6)

I believe the answer is:

closer

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'more intimate?' is the definition.
('close' can be similar in meaning to 'intimate')

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

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(Other definitions for closer that I've seen before include "one concludes" , "More near or imminent" , "within a shorter distance" , "more precise" , "not so remote" .)

I've seen this clue in the Evening Standard.

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