Art is performed for part of the flight (5)
I believe the answer is:
stair
'part of the flight' is the definition.
(I've seen this before)
'art is performed' is the wordplay.
'performed' is an anagram indicator.
'art'+'is'='artis'
'artis' with letters rearranged gives 'STAIR'.
'for' acts as a link.
(Other definitions for stair that I've seen before include "One step of a flight" , "means to go down" , "Tread and riser" , "section of flight" , "One of a flight of steps" .)