Preparing dosa and sambar for envoy (10)
I believe the answer is:
ambassador
'envoy' is the definition.
(I've seen this before)
'preparing dosa and sambar' is the wordplay.
'preparing' is an anagram indicator.
'and' is a charade indicator (letters next to each other).
'dosa' put after 'sambar' is 'sambardosa'.
'sambardosa' anagrammed gives 'AMBASSADOR'.
'for' acts as a link.
(Other definitions for ambassador that I've seen before include "foreign agent" , "accredited diplomat" , "Senior diplomat" , "diplomatic type" , "Messenger" .)