Issue of old judge swallowing one drink (9)
I believe the answer is:
originate
'issue' is the definition.
(I've seen this before)
'of old judge swallowing one drink' is the wordplay.
'of' becomes 'o''.
'old judge' becomes 'rate' (rating is a kind of judging. I am not sure about the 'old' bit.).
'swallowing' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'drink' becomes 'gin' (gin is a kind of drink).
'i'+'gin'='igin'
'rate' going around 'igin' is 'riginate'.
'o'+'riginate'='ORIGINATE'
Can you help me to learn more?
(Other definitions for originate that I've seen before include "Invent" , "issue" , "pioneer" , "Set up" , "Stem" .)