I make gibes about Northern people, creating outrage (11)
I believe the answer is:
indignation
'outrage' is the definition.
(I know that outrage can be written as indignation)
'i make gibes about northern people' is the wordplay.
'i make gibes' becomes 'idig' (I am not sure about this - if you are sure you should believe this answer much more).
'about' is an insertion indicator.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'people' becomes 'nation'.
'idig' placed around 'n' is 'indig'.
'indig'+'nation'='INDIGNATION'
'creating' is the link.
Can you help me to learn more?
(Other definitions for indignation that I've seen before include "Resentment" , "Annoyance at getting 12 down" , "Outrage, dudgeon" , "righteous anger" .)