Ring judge to speak at length (5)
I believe the answer is:
orate
'speak at length' is the definition.
(to orate is to give a speech)
'ring judge' is the wordplay.
'ring' becomes 'O' (O is the shape of a ring).
'judge' becomes 'rate' (rating is a kind of judging).
'o'+'rate'='ORATE'
'to' acts as a link.
(Other definitions for orate that I've seen before include "Make a pompous speech" , "talk at length" , "Speak in florid style" , "Make a lengthy speech" , "Harangue" .)