Modern music before fantastic tour has American ''over the moon (9)
I believe the answer is:
rapturous
'''over the moon' is the definition.
(I've seen this before)
'modern music before fantastic tour has american' is the wordplay.
'modern music' becomes 'rap' (I've seen this in another clue).
'before' says to put letters next to each other.
'fantastic' indicates an anagram.
'has' is a charade indicator (letters next to each other).
'american' becomes 'us' (abbreviation for United States).
'tour' with letters rearranged gives 'turo'.
'rap'+'turo'+'us'='RAPTUROUS'
(Other definitions for rapturous that I've seen before include "over the moon" , "Feeling great pleasure" , "Blissful" , "Ecstatic" , "Delighted" .)