Festive music round the States for the revelling (8)
I believe the answer is:
carousal
'the revelling' is the definition.
I can't judge whether this definition defines the answer.
'festive music round the states' is the wordplay.
'festive music' becomes 'carol' (carol is a kind of music. I am not sure about the 'festive' bit.).
'round' means one lot of letters goes inside another.
'the states' becomes 'usa' (United States of America).
'carol' placed around 'usa' is 'CAROUSAL'.
'for' is the link.
Can you help me to learn more?
(Other definitions for carousal that I've seen before include "Lively drinking party" , "Bacchanal" , "A drink-and-be-merry session" , "Revels" , "Merry drinking party" .)