Kind of song or light orchestral piece (5)
I believe the answer is:
torch
'kind of song' is the definition.
'or light orchestral piece' is the wordplay.
'piece' indicates a hidden word.
'TORCH' is hidden within 'or light orchestral'.
(Other definitions for torch that I've seen before include "Portable lamp; set alight" , "Hand-held lamp or burning stick" , "Light carried in the hand" , "Small portable battery-powered electric lamp" , "source of enlightenment" .)