Does it shed a ghostly light? (10)

I believe the answer is:

spiritlamp

I'm a little stuck... Click here to teach me more about this clue!

'does it shed a' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'ghostly light?' is the wordplay.
'ghostly' becomes 'spirit' (I can't justify this - if you can you should believe this answer much more).
'light?' becomes 'lamp' (lamp is a kind of light).
'spirit'+'lamp'='SPIRITLAMP'

Can you help me to learn more?

I've seen this clue in The Irish Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.