Disney character in quiet airport? Not quite! (5)
I believe the answer is:
pluto
'disney character' is the definition.
(I know that Pluto is a fictional character)
'quiet airport? not quite' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'airport?' becomes 'Luton' (London Luton Airport).
'not quite' means to remove the last letter (most but not all of the word).
'luton' with its last letter removed is 'luto'.
'p'+'luto'='PLUTO'
'in' acts as a link.
(Other definitions for pluto that I've seen before include "Planet beyond Neptune" , "Minor planet" , "Hollywood creation" , "Planet furthest from the sun" , "cartoon character" .)