Crossword Genius

Firmly attach small part of body (4)

Ross

I believe the answer is:

nail

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'firmly attach' is the definition.
(attach with nails)

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

Can you help me to learn more?

(Other definitions for nail that I've seen before include "Fix with a metal spike" , "Brad or tack" , "Metal pin, hit it on the head" , "thing for keeping things together" , "Brad, for example" .)

I've seen this clue in The Guardian.
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