Handsome judge adorable? Not half! (12)
I believe the answer is:
considerable
'handsome' is the definition.
(thesaurus)
'judge adorable? not half' is the wordplay.
'judge' becomes 'consider' (I've seen this before).
'not half' indicates taking half.
'adorable' halved is 'able'.
'consider'+'able'='CONSIDERABLE'
(Other definitions for considerable that I've seen before include "Fairly large or numerous" , "A lot (of) - worthy of respect" , "Tidy" , "Notably large" , "Great" .)