More friendly with, he concludes (6)

I believe the answer is:

closer

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'more' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for closer that I've seen before include "Nearer or more penny-pinching" , "Less distant" , "More near or imminent" , "not so remote" , "Stuffier" .)

I've seen this clue in the Evening Standard.

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