Celebrity swallowed one during flight (5)
I believe the answer is:
stair
'flight' is the definition.
(I've seen this before)
'celebrity swallowed one during' is the wordplay.
'celebrity' becomes 'star' (a star is a celebrity or famous person).
'swallowed one' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'during' means one lot of letters goes inside another.
'star' going around 'i' is 'STAIR'.
Can you help me to learn more?
(Other definitions for stair that I've seen before include "Support on which to step" , "One step of a flight" , "Word linking way and well" , "single step in a series" , "Rising step" .)