Shortly up and about, I’m sparkling (4)
I believe the answer is:
asti
'i'm sparkling' is the definition.
(Asti is sparkling wine)
'shortly up and about' is the wordplay.
'shortly' means to remove the last letter.
'up and about' becomes 'astir' (both can mean awake).
'astir' with its final letter taken off is 'ASTI'.
(Other definitions for asti that I've seen before include "Piedmontese white wine" , "Italian wine - (then change a letter for ...)" , "Piedmont wine city, SE of Turin" , "Italian town, famous for its wine" , "Sparkling drink" .)