Clown dignified for a few weeks in summer (6)
I believe the answer is:
august
I believe this clue is a triple definition!
'clown' is the first definition.
(type of clown wearing special make-up)
'dignified' is the second definition.
(august can mean regal or noble)
'for' is a link.
'a few weeks in summer' is the third definition.
(August is a summer month)
(Other definitions for august that I've seen before include "Dignified - month" , "Inspiring respect; month" , "A grand month?" , "Gregorian calendar month" , "Month named after a Roman emperor" .)