Handsome judge - and clever (12)
I believe the answer is:
considerable
'handsome' is the definition.
(thesaurus)
'judge and clever' is the wordplay.
'judge' becomes 'consider' (I've seen this before).
'and' says to put letters next to each other.
'clever' becomes 'able' (I've seen this before).
'consider'+'able'='CONSIDERABLE'
(Other definitions for considerable that I've seen before include "A lot (of) - worthy of respect" , "Significant" , "worth entertaining?" , "Major" , "Relatively large" .)