Full scale (5)

I believe the answer is:

gamut

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'scale' is the definition.
(I know that gamut is a type of scale)

I don't understand how the rest of the clue works.

(Other definitions for gamut that I've seen before include "Entire scale" , "Full (emotional) range" , "Complete range (of something)" , "Full range, compass" , "Full extent" .)

I've seen this clue in the Evening Standard.

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