Repulsive material makes stomachs turn (4)

I believe the answer is:

smut

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'repulsive material' is the definition.
'smut' can be an answer for 'material' (I have seen 'Pornographic material' mean 'smut' so perhaps 'material' could also mean 'smut'). I'm not certain of the 'repulsive' bit.

'stomachs turn' is the wordplay.
'stomachs' becomes 'tums' ('tum' can be a synonym of 'stomach').
'turn' is a reversal indicator.
'tums' reversed gives 'SMUT'.

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for smut that I've seen before include "Dirty jokes - black mark" , "Dirt or pornography" , "Sooty matter" , "Salacious material" , "Sooty deposit" .)

I've seen this clue in The Guardian.

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