Order from judge to speak up (5)
I believe the answer is:
orate
'to speak up' is the definition.
(I've seen this in another clue)
'order from judge' is the wordplay.
'order' becomes 'o' (abbreviation e.g. in British honours OM, OBE etc.).
'from' means one lot of letters go next to another.
'judge' becomes 'rate' (rating is a kind of judging).
'o'+'rate'='ORATE'
(Other definitions for orate that I've seen before include "Speak like Cicero?" , "Hold forth" , "Give a formal address" , "Speak pompously and at length" , "Erato (anag.)" .)