Entire range (5)
'entire range' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gamut that I've seen before include "The whole range of, say emotions" , "Full range, compass" , "Full (emotional) range" , "Entire scale" , "Complete extent or range" .)
(Other definitions for ambit that I've seen before include "Scope, extent, or bounds of something" , "Limits" , "round" , "Compass, scope" , "Circuit, compass" .)