Teetotal locum associated with English judge (9)
I believe the answer is:
temperate
'teetotal' is the definition.
(thesaurus)
'locum associated with english judge' is the wordplay.
'locum' becomes 'temp' (I can't justify this - if you can you should give a lot more credence to this answer).
'associated with' says to put letters next to each other.
'english' becomes 'e' (abbreviation).
'judge' becomes 'rate' (rating is a kind of judging).
'temp'+'e'+'rate'='TEMPERATE'
Can you help me to learn more?
(Other definitions for temperate that I've seen before include "Controlled" , "even" , "It is reasonable" , "benign" , "With mild climate" .)