Do such lamps give a ghostly light? (6)
I believe the answer is:
spirit
This clue might be a double definition.
'do such lamps' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'give a ghostly light?' is the second definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for spirit that I've seen before include "Supernatural being without a body" , "Vivacity" , "enthusiasm" , "bottle?" , "eg Whisky or gin" .)