Singing with spirit (3)
I believe the answer is:
gin
'spirit' is the definition.
(alcoholic spirit)
'singing with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'GIN' is hidden in the letters of 'singing'.
(Other definitions for gin that I've seen before include "Spirit; cotton machine" , "Liquor flavoured with juniper berries" , "Clear alcoholic drink" , "Trap for catching animals" , "Spirit, aka 'Mother's ruin'" .)