Mockery made of exposed Tsar with flag (6)
I believe the answer is:
satire
'mockery' is the definition.
(I've seen this before)
'exposed tsar with flag' is the wordplay.
'exposed' indicates the central letters (outside letters removed).
'with' is a charade indicator (letters next to each other).
'flag' becomes 'tire' (both can mean to become weary).
The middle of 'tsar' is 'sa'.
'sa'+'tire'='SATIRE'
'made of' acts as a link.
(Other definitions for satire that I've seen before include "Witty language used to convey insults or scorn" , "Mockery" , "text of Juvenal" , "Writings ridiculing vice and folly" , "Humorous criticism of folly or vice" .)