Usefulness (7)

I think it could be either:

Which length description are you looking for?:

utility

'usefulness' is the definition.
(I know that usefulness can be written as utility)

This is all the clue.

(Other definitions for utility that I've seen before include "Service such as electricity or water" , "Gas, electricity, etc" , "Usefulness" , "Practicality - public service" , "Benefit" .)

I've seen this clue in The Irish Independent and The Times.

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