Pleasant-sounding lute: fun to play (7)
I believe the answer is:
tuneful
'pleasant-sounding' is the definition.
(thesaurus)
'lute fun to play' is the wordplay.
'to play' 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" , "Euphonic" , "Euphonious" , "Melodic" .)