Declaim nothing when meeting judge (5)
I believe the answer is:
orate
'declaim' is the definition.
(I've seen this in another clue)
'nothing when meeting judge' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'when meeting' says to put letters next to each other.
'judge' becomes 'rate' (rating is a kind of judging).
'o'+'rate'='ORATE'
(Other definitions for orate that I've seen before include "Erato (anag.)" , "Give speech" , "Speak in florid style" , "Speechify" , "Speaker may" .)