Red tunic mom's torn (9)
I believe the answer is:
communist
'red' is the definition.
(thesaurus)
'tunic mom's torn' is the wordplay.
'torn' indicates anagramming the letters.
'tunic'+'moms'='tunicmoms'
'tunicmoms' anagrammed gives 'COMMUNIST'.
(Other definitions for communist that I've seen before include "Person who practices communal living" , "Russian?" , "Document of 1848 . . ." , "Eg, Marxist" .)