They're spent making a bit of love amid the trees (6)

I believe the answer is:

fivers

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'they're spent making a bit' is the definition.
The definition suggests an adverb but the answer is not.

'love amid the trees' is the wordplay.
'love' becomes 've' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'amid' indicates putting letters inside.
'the trees' becomes 'firs' (fir is a kind of tree).
've' inserted inside 'firs' is 'FIVERS'.

'of' acts as a link.

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I've seen this clue in the Evening Standard.

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