Crossword Genius

Obscene stuff turned stomachs (4)

Ross

I believe the answer is:

smut

'obscene stuff' is the definition.
(I've seen this before)

'turned stomachs' is the wordplay.
'turned' says the letters should be written in reverse.
'stomachs' becomes 'tums' ('tum' can be a synonym of 'stomach').
'tums' reversed gives 'SMUT'.

(Other definitions for smut that I've seen before include "Lewd material" , "Smudge of soot" , "Sooty matter" , "Small flake of dirt" , "Disease of cereal grass" .)

I've seen this clue in The Guardian.
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