Crossword Genius

"Fastener" is more analogous (6)

Ross

I believe the answer is:

closer

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'analogous' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

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(Other definitions for closer that I've seen before include "More airless; nearer" , "More near or imminent" , "Nearer or meaner" , "Nearer in time or space" , "Stuffier" .)

I've seen this clue in the Evening Standard.
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