Final part of airport? (8)
I believe the answer is:
terminal
This clue is a double definition.
'final' is the first definition.
(I know that final can be written as terminal)
'part of airport?' is the second definition.
(I know that terminal is part of airport)
(Other definitions for terminal that I've seen before include "Deadly" , "End point of line - section of airport" , "Ending in death" , "Forming an end" , "Of an illness causing death" .)