Robustness (10)

I think it could be either:

Which length description are you looking for?:

sturdiness

'robustness' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for sturdiness that I've seen before include "Strength, solidity" , "Showing muscularity" .)

I've seen this clue in the Sydney Morning Herald.

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