Cross, but showing wit as well as anger (7)
I believe the answer is:
saltire
'cross' is the definition.
(I know that saltire is a type of cross)
'wit as well as anger' is the wordplay.
'wit' becomes 'salt' (salt can mean wit or spirit).
'as well as' is a charade indicator (letters next to each other).
'anger' becomes 'ire' (ire is intense rage).
'salt'+'ire'='SALTIRE'
'but showing' is the link.
(Other definitions for saltire that I've seen before include "X-shaped cross" , "Diagonal cross (heraldry)" , "Heraldic cross" , "Cross like St Andrew's" , "standard for Scots" .)