Current PM returned agreement for freedom (8)
I believe the answer is:
impunity
'freedom' is the definition.
(impunity is a kind of freedom)
'current pm returned agreement' is the wordplay.
'current' becomes 'i' (symbol for electric current).
'returned' says the letters should be written backwards.
'agreement' becomes 'unity' (I've seen this before**).
'pm' reversed gives 'mp'.
'i'+'mp'+'unity'='IMPUNITY'
'for' is the link.
(Other definitions for impunity that I've seen before include "Rascal, by agreement, gets exemption" , "Freedom from punishment" , "Complete protection from unpleasant consequences" , "impossibility of punishment" , "Exemption from punishment or loss" .)