Charlie plays moving love song (7)
I believe the answer is:
calypso
'song' is the definition.
(I've seen this before)
'charlie plays moving love' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'moving' indicates an anagram.
'love' becomes 'o' (love means zero in tennis).
'plays' is an anagram of 'alyps'.
'c'+'alyps'+'o'='CALYPSO'
(Other definitions for calypso that I've seen before include "who detained Odysseus?" , "West Indian song with variable rhythm and improvised words" , "Topical West Indian song - orchid - sea nymph" , "West Indian ballad - Homerian sea nymph" , "Sea nymph of Greek mythology - Caribbean ballad" .)