Supporter with lease redrafted in lawyers' jargon (8)
I believe the answer is:
legalese
'lawyers' jargon' is the definition.
'legalese' can be an answer for 'jargon' (legal jargon). I'm not sure about the 'lawyers'' bit.
'supporter with lease redrafted' is the wordplay.
'supporter' becomes 'leg' (I've seen this in another clue).
'with' is a charade indicator (letters next to each other).
'redrafted' indicates an anagram (to redraft something is to improve or rewrite it).
'lease' anagrammed gives 'alese'.
'leg'+'alese'='LEGALESE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for legalese that I've seen before include "Bar talk" , "formal language" , "such language at the bar!" , "contract wording?" , "barman's peculiar words" .)