Angry, upset about a right sort of loaf (7)
I believe the answer is:
granary
'sort of loaf' is the definition.
(type of bread)
'angry upset about a right' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'angry' with letters rearranged gives 'grany'.
'a'+'r'='ar'
'grany' going around 'ar' is 'GRANARY'.
(Other definitions for granary that I've seen before include "Store for, eg, corn" , "Storehouse for corn, etc" , "Harvest store" , "Storehouse for wheat or corn, say" , "cereal 21 [STORES]" .)