Handsome judge - and clever (12)
I believe the answer is:
Here is my best explanation:
'handsome' is the definition.
'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).
(Other definitions for considerable that I've seen before include "Fairly large or numerous", "Significant", "Major", "tidy", "worth entertaining?", "Notably large", "Relatively large", "Large", "A lot (of) - worthy of respect" and "worthy of attention".)