Unusual way to display anger (7)
I believe the answer is:
strange
'unusual' is the definition.
(I know that unusual can be written as strange)
'way to display anger' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'to display' indicates an anagram (I've seen 'displaying' mean this (the anagrammed letters display the answer)).
'anger' is an anagram of 'range'.
'st'+'range'='STRANGE'
(Other definitions for strange that I've seen before include "Queer" , "Bizarre" , "Different" , "Unknown or peculiar" , "Offbeat" .)