Crossword Genius

Spectrum (7)

Ross

I think it could be either:

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5

7

rainbow

'spectrum' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rainbow that I've seen before include "Polychromatic arc" , "weather feature" , "heavenly sight" , "'I can sing a - - ' (song)" , "Arc of colored light in the sky" .)

I've seen this clue in The Telegraph.
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