Heavens, half of spirit's gone (3)
I believe the answer is:
sky
'heavens' is the definition.
(sky is a kind of heavens)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for sky that I've seen before include "Strike up" , "Orbiting space-station" , "Weather" , "broadcaster" , "Upper region, empyrean" .)