Speak at length with old judge (5)
I believe the answer is:
orate
'speak at length' is the definition.
(to orate is to give a speech)
'with old judge' is the wordplay.
'with' is a charade indicator (letters next to each other).
'old' becomes 'o' (abbreviation).
'judge' becomes 'rate' (rating is a kind of judging).
'o' next to 'rate' is 'ORATE'.
(Other definitions for orate that I've seen before include "Lecture" , "Speak pompously and at length" , "talk at length" , "Make a pompous speech" , "Speechify" .)