Crossword Genius

They won't get tight if stripped (4,3,5)

Ross

I believe the answer is:

nuts and bolts

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nuts and bolts that I've seen before include "Carries out hit-and-run attack" , "Fastening equipment" , "Basic essentials (colloq.)" , "DDessentials of the ironmonger's trade?" , "brass tacks?" .)

I've seen this clue in The Globe and Mail.
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