Charlie plays around with love song (7)
I believe the answer is:
calypso
'song' is the definition.
(thesaurus)
'charlie plays around with love' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'around with' indicates anagramming the letters.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'plays' anagrammed with 'o' can make 'alypso'.
'c'+'alypso'='CALYPSO'
(Other definitions for calypso that I've seen before include "Satirical West Indian ballad - orchid - sea nymph" , "island song" , "West Indian music style" , "character from Odyssey" , "A number of West Indians" .)