Amnesty International stops representative ever returning (8)
I believe the answer is:
reprieve
'amnesty' is the definition.
(reprieve is a kind of amnesty)
'international stops representative ever returning' is the wordplay.
'international' becomes 'i' (abbreviation eg in IMF).
'stops' is an insertion indicator.
'representative' becomes 'rep' (rep is a kind of representative).
'returning' says the letters should be written in reverse.
'ever' backwards is 'reve'.
'rep'+'reve'='repreve'
'i' placed inside 'repreve' is 'REPRIEVE'.
(Other definitions for reprieve that I've seen before include "Forgive" , "Cancel the punishment of (someone)" , "cancellation of death warrant" , "Allow to go unpunished" , "Punishment cancellation" .)