Cause pins to be used with anger (7)
I believe the answer is:
inspire
'cause' is the definition.
(I know that inspire is a more specific form of occasion)
'pins to be used with anger' is the wordplay.
'to be used' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'anger' becomes 'ire' (ire is intense rage).
'pins' is an anagram of 'insp'.
'insp'+'ire'='INSPIRE'
(Other definitions for inspire that I've seen before include "Give rise to (a feeling)" , "Fill with ideas, enthusiasm" , "Cause to occur; animate" , "Give (feeling of) creativity to" , "Enhearten" .)