Famous performer carrying one item of luggage for flight (9)
I believe the answer is:
staircase
'flight' is the definition.
(I've seen this before)
'famous performer carrying one item of luggage' is the wordplay.
'famous performer' becomes 'star' (I've seen this before).
'carrying' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'item of luggage' becomes 'case' (I've seen this before).
'star' enclosing 'i' is 'stair'.
'stair'+'case'='STAIRCASE'
'for' acts as a link.
(Other definitions for staircase that I've seen before include "A group of linked canal locks" , "Route between floors" , "Situation of flight" , "Flight of steps" , "It's Caesar (anag.)" .)