Uselessness more than usefulness (8)

I believe the answer is:

futility

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'uselessness' is the definition.
(futility is a kind of uselessness)

'more than usefulness' is the wordplay.
'more than' becomes 'f' (I can't justify this - if you can you should give a lot more credence to this answer).
'usefulness' becomes 'utility' (I've seen this before).
'f'+'utility'='FUTILITY'

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(Other definitions for futility that I've seen before include "Uselessness" , "Pointlessness" , "No prospect of success" .)

I've seen this clue in The Irish News.

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