Give up going into case for exemplary justice (6)
I believe the answer is:
equity
'justice' is the definition.
(equity is a kind of justice)
'give up going into case for exemplary' is the wordplay.
'give up' becomes 'quit' (both can mean to resign).
'going into' means one lot of letters goes inside another.
'case for' means to remove the middle letters (the letters which encase the others are used).
'exemplary' with its centre taken out is 'ey'.
'quit' inserted into 'ey' is 'EQUITY'.
(Other definitions for equity that I've seen before include "Fair play - actors' union" , "Value of a property less debt" , "Fairness; shareholding" , "actors' group" , "Stake in business" .)