By delaying, causing to lose one’s enjoyment of (7,3)

I believe the answer is:

putting off

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'by delaying' is the definition.
'putting off' can be an answer for 'delaying' (putting off is a kind of delaying). I am unsure of the 'by' bit.

I can't explain the rest of the clue.

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I've seen this clue in the Evening Standard.

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