Spectrum, gamut (5)
I believe the answer is:
range
This clue is a double definition.
'spectrum' is the first definition.
(a spectrum is a range or variety)
'gamut' is the second definition.
(I've seen this in another clue)
(Other definitions for range that I've seen before include "Extent - shooting area" , "Enclosed kitchen fireplace" , "Where to cook" , "cover a certain area" , "Variation within limits" .)