Extent of anger varied (5)
I believe the answer is:
range
'extent' is the definition.
(I know that range is a type of extent)
'anger varied' is the wordplay.
'varied' indicates an anagram.
'anger' anagrammed gives 'RANGE'.
'of' is the link.
(Other definitions for range that I've seen before include "Take sides" , "Array" , "Aga or mountain, perhaps?" , "Shooting area - group of mountains" , "Grassland - variety" .)