Comparatively slow getting to the air terminal (5)
I believe the answer is:
later
'comparatively' is the definition.
Both the definition and answer are adverbs. Perhaps there's an association between them I don't understand?
'slow getting to the air terminal' is the wordplay.
'slow' becomes 'late' (I've seen this in other clues).
'getting to' is a charade indicator (letters next to each other).
'terminal' says to take the final letters (the final or terminal letter).
The last letter of 'air' is 'r'.
'late'+'r'='LATER'
Can you help me to learn more?
(Other definitions for later that I've seen before include "Following" , "After a given point in time" , "Eventually" , "more modern" , "At a subsequent time" .)