Crossword Genius

Twenty-four hours without any answers for firm (6)

Ross

I believe the answer is:

sturdy

'for firm' is the definition.
(firm can mean sturdy or solid)

I can't explain the remainder of the clue.

(Other definitions for sturdy that I've seen before include "Hardy, stalwart" , "Powerful" , "Strongly and solidly built" , "Well-constructed" , "Firmly constructed" .)

I've seen this clue in The Times.
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