Wine sent spilling over cat (8)
I believe the answer is:
spumante
'wine' is the definition.
(Italian white wine)
'sent spilling over cat' is the wordplay.
'spilling' is an anagram indicator.
'over' means one lot of letters goes inside another.
'cat' becomes 'puma' (puma is a kind of cat).
'sent' is an anagram of 'snte'.
'snte' going around 'puma' is 'SPUMANTE'.
(Other definitions for spumante that I've seen before include "See 1" , "sparkling Italian wine" , "Bubbly" , "Italian sparking wine" .)