One judge filled with wrath (5)
I believe the answer is:
irate
'filled with wrath' is the definition.
'one judge' is the wordplay.
'one' becomes 'i' (Roman numeral).
'judge' becomes 'rate' (rating is a kind of judging).
'i'+'rate'='IRATE'
(Other definitions for irate that I've seen before include "Hacked off" , "Full of 22" , "Boiling" , "Magical rod" , "Annoyed, nettled" .)