Melodious lute fun, possibly (7)
I believe the answer is:
tuneful
'melodious' is the definition.
(synonyms)
'lute fun possibly' is the wordplay.
'possibly' is an anagram indicator.
'lute'+'fun'='lutefun'
'lutefun' with letters rearranged gives 'TUNEFUL'.
(Other definitions for tuneful that I've seen before include "Harmonious" , "With a pleasing musical sound" , "Melodic" , "Euphonious" , "Euphonic" .)