Popular Indian leader, shut your face! (6)
I believe the answer is:
modish
'popular' is the definition.
(I know that modish is a more specific form of the attribute popular)
'indian leader shut your face' is the wordplay.
'indian leader' becomes 'Modi' (Narendra Modi, Indian prime minister).
'shut your face' becomes 'sh' (both are ways of telling someone to be quiet).
'modi'+'sh'='MODISH'
(Other definitions for modish that I've seen before include "In fashion or style" , "Trendy" , "In vogue or fashion" , "in the latest fashion?" , "Temporarily fashionable" .)