Harangue from old judge (5)
I believe the answer is:
orate
'harangue' is the definition.
(thesaurus)
'old judge' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'judge' becomes 'rate' (rating is a kind of judging).
'o'+'rate'='ORATE'
'from' is the link.
(Other definitions for orate that I've seen before include "Speak like Cicero?" , "Hold forth" , "Lecture" , "Make a pompous speech" , "Spout" .)