Wine could get adult moving -- sit! (4)
I believe the answer is:
asti
'wine' is the definition.
(Italian wine)
'get adult moving sit' is the wordplay.
'get' is a charade indicator (letters next to each other).
'adult' becomes 'a' (abbreviation).
'moving' indicates anagramming the letters.
'sit' with letters rearranged gives 'sti'.
'a' next to 'sti' is 'ASTI'.
'could' is the link.
(Other definitions for asti that I've seen before include "Source of fizz" , "- spumante, It. wine" , "Piedmont wine city, SE of Turin" , "Italian product" , "Italian town producing sparkling wine" .)