Change in international terminals (5)
I believe the answer is:
alter
'change' is the definition.
(I know that change can be written as alter)
'in international terminals' is the wordplay.
'in' says the answer is hidden in the clue.
'ALTER' is hidden within 'international terminals'.
(Other definitions for alter that I've seen before include "Make changes to" , "Bout of extravagant spending" , "convert" , "reform" , "Revise" .)