Glum local hymn played with energy (10)
I believe the answer is:
melancholy
'glum' is the definition.
(thesaurus)
'local hymn played with energy' is the wordplay.
'played with' indicates an anagram.
'energy' becomes 'e' (physics symbol as in E=mc2).
'local'+'hymn'='localhymn'
'localhymn' mixed up with 'e' makes 'MELANCHOLY'.
(Other definitions for melancholy that I've seen before include "Low spirits" , "Cheerless" , "[ODE] subject" , "Sad - tendency to depression" , "Gloomy, sad" .)