Paragon belittled sap without good reason (7)
I believe the answer is:
justice
'paragon belittled' is the definition.
I can't judge whether this defines the answer.
'sap without good reason' is the wordplay.
'sap' becomes 'juice' (I've seen this before).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'good reason' becomes 'st' (I can't justify this - if you can you should believe this answer much more).
'juice' placed around 'st' is 'JUSTICE'.
Can you help me to learn more?
(Other definitions for justice that I've seen before include "right outcome" , "One of man's 22 20 [SEVEN AGES]" , "Magistrate's title" , "Fair play" , "Judge, magistrate" .)