Entire range (5)
'entire range' is the definition.
(I've seen this before)
This is all the 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" .)