Old judge catching one with trap to begin (9)
I believe the answer is:
Here is my best explanation:
'begin' is the definition.
(I've seen this before)
'old judge catching one with trap' is the subsidiary indication.
'old' becomes 'o'.
'judge' becomes 'rate' (rating is a kind of judging**).
'catching' indicates putting letters inside.
'one with' becomes 'i' (I've seen this in other clues).
'trap' becomes 'gin' (gin is a kind of trap).
'rate' going around 'igin' is 'riginate'.
'to' is the link.
(Other definitions for originate that I've seen before include "Initiate", "Begin", "Arise, start", "Start", "Come into existence", "Create, initiate", "Bring into existence", "Create; begin", "Stem" and "Cause to begin, be the first".)