Hot drink, say, absorbed by revolutionary rag (5)
I believe the answer is:
negus
'hot drink' is the definition.
(I've seen this before)
'say absorbed by revolutionary rag' is the wordplay.
'say' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'absorbed by' indicates putting letters inside.
'revolutionary' says the letters should be written backwards.
'rag' becomes 'sun' (I've seen this before).
'sun' in reverse letter order is 'nus'.
'eg' put inside 'nus' is 'NEGUS'.
(Other definitions for negus that I've seen before include "Abyssinian king - spiced drink" , "Hot stimulant" , "Drink that's heated" , "Ruler in Africa" , "Warm drink" .)