Amateur Romeo falls for woman's bottom in hanky-panky (6)

I believe the answer is:

nookie

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'amateur' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?

I can't explain the remainder of the clue.

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(Other definitions for nookie that I've seen before include "Sex (slang)" , "fun" , "relations commonly" , "Sexual intercourse (slang)" , "Congress" .)

I've seen this clue in the Sydney Morning Herald.

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