Mother involved in hideous revolting 'domestic' (9)
I believe the answer is:
housemaid
'domestic' is the definition.
(housemaid is a kind of domestic)
'mother involved in hideous revolting' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'involved in' means one lot of letters goes inside another.
'revolting' is an anagram indicator.
'hideous' anagrammed gives 'houseid'.
'ma' going into 'houseid' is 'HOUSEMAID'.
(Other definitions for housemaid that I've seen before include "scrubber" , "girl with bad knee?" , "menial role" , "Help" .)