Crossword Genius

Chair joint sounds weak (4)

Ross

I believe the answer is:

puny

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'weak' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

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(Other definitions for puny that I've seen before include "Small and feeble" , "Paltry" , "Weak - unimportant" , "in need of development" , "Insignificant" .)

I've seen this clue in The Irish Times.
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