Crossword Genius

Ghostly: just like the light coming from a prism? (8)

Ross

I believe the answer is:

spectral

I believe this is a double definition.

'ghostly' is the first definition.
(synonyms)

'just like the light coming from a prism?' is the second definition.
(a prism shows the spectrum of visible light)

(Other definitions for spectral that I've seen before include "covering a range of colours" , "Like a colourful band" , "Ghostly; of bands of colour" , "Rap Celts for being ghostly" , "Ghastly" .)

I've seen this clue in The Telegraph.
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