Angry behaviour? Strike attendant (7)
I believe the answer is:
rampage
'angry behaviour' is the definition.
'strike attendant' is the wordplay.
'strike' becomes 'ram' (I've seen this before).
'attendant' becomes 'page' (page is a kind of attendant).
'ram'+'page'='RAMPAGE'
(Other definitions for rampage that I've seen before include "Go berserk" , "Charge around being wild and destructive" , "Run wild" , "Destructive spree" , "Rage wildly around" .)