Red tonic mum's drunk (9)
I believe the answer is:
communist
'red' is the definition.
(I know that communist is a type of red)
'tonic mum's drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'tonic'+'mums'='tonicmums'
'tonicmums' with letters rearranged gives 'COMMUNIST'.
(Other definitions for communist that I've seen before include "Russian?" , "Eg, Marxist" , "Person who practices communal living" , "Document of 1848 . . ." .)