Fast getting chilly (5)
I believe the answer is:
nippy
This clue might be a double definition.
'fast' is the first definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'chilly' is the second definition.
(I've seen this before)
'getting' is the link.
Can you help me to learn more?
(Other definitions for nippy that I've seen before include "Rather cold" , "Slightly cold?" , "Sort of weather" , "Nimble; chilly" , "Quickly-moving" .)