Read law wrong, getting unfair treatment (3,4)
I believe the answer is:
raw deal
'unfair treatment' is the definition.
(I've seen this before)
'read law wrong' is the wordplay.
'wrong' is an anagram indicator.
'read'+'law'='readlaw'
'readlaw' is an anagram of 'RAW DEAL'.
'getting' acts as a link.
(Other definitions for raw deal that I've seen before include "cruel treatment" , "'Harsh, unfair treatment (3,4)'" , "Unfair treatment like uncooked timber" , "Poor bargain" , "Unjust payoff" .)