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It doesn’t cost a dime, darling (4,4)

Ross

I believe the answer is:

free love

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'it doesn't cost a dime darling' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for free love that I've seen before include "General Congress" , "Promiscuity" , "presumably ruling out bondage" .)

I've seen this clue in the Evening Standard.
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