Love of money (3)

I think it could be either:

Which length description are you looking for?:

oof

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'money' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'love of' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'o'+'of'='OOF'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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