Crossword Genius

Single men barred from orgy, catching flogger's interest in passing (9)

Ross

I believe the answer is:

scatology

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'single' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

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(Other definitions for scatology that I've seen before include "Excessive interest in obscene things" , "dropping science" .)

I've seen this clue in The Independent.
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