Mean to show anger following welcome (7)
I believe the answer is:
average
'mean' is the definition.
('average' can be a synonym of 'mean')
'anger following welcome' is the wordplay.
'anger' becomes 'rage' (rage is a kind of anger).
'following' is a charade indicator (letters next to each other).
'welcome' becomes 'ave' (I've seen this before).
'rage' after 'ave' is 'AVERAGE'.
'to show' is the link.
(Other definitions for average that I've seen before include "par" , "just like any other" , "Mean - medium" , "Mean - typical" , "Medial" .)