Celeb carrying one item of luggage for flight (9)
I believe the answer is:
staircase
'flight' is the definition.
(I've seen this before)
'celeb carrying one item of luggage' is the wordplay.
'celeb' 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' placed around 'i' is 'stair'.
'stair'+'case'='STAIRCASE'
'for' acts as a link.
(Other definitions for staircase that I've seen before include "Way between floors" , "Situation of flight" , "It's Caesar (anag.)" , "A group of linked canal locks" , "Group of joined locks on a canal" .)