Offending Queen with tirade (6)
I believe the answer is:
errant
'offending' is the definition.
(errant can mean going astray or doing wrong)
'queen with tirade' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'with' says to put letters next to each other.
'tirade' becomes 'rant' (both can mean an angry outburst).
'er'+'rant'='ERRANT'
(Other definitions for errant that I've seen before include "Nomadic" , "Travelling in search of adventure like knight of old" , "Off the mark, wandering" , "Like many a knight" , "Kind of knight who once travelled for adventure" .)