Crossword Genius

Range of mushrooms sent back with cap trimmed (8)


I believe the answer is:


'range' is the definition.
(a spectrum is a range or variety)

I cannot understand how the remainder of the clue works.

(Other definitions for spectrum that I've seen before include "Complete colour range" , "Band of refracted colours" , "An entire range of related qualities of crumpets" , "Crumpets can provide the full array of colours" , "Bands of colour in crumpets" .)

I've seen this clue in The Times and The Telegraph.
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