Steadiness

I think it could be either:

Which length description are you looking for?:

balance

'steadiness' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for balance that I've seen before include "Weighing apparatus" , "State of equilibrium" , "A steady position as on scales" , "Rest" , "Surplus" .)

I've seen this clue in the Evening Standard.

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