Beyond redemption? What rotten luck! (3,3)
I believe the answer is:
too bad
'beyond redemption?' is the definition.
I can't judge whether this defines the answer.
'rotten luck' is the wordplay.
'rotten' becomes 'too' (I can't explain this - if you can you should believe this answer much more).
'luck' becomes 'bad luck' (bad luck is a kind of luck).
'too'+'bad'='TOO BAD'
'what' acts as a link.
Can you help me to learn more?
(Other definitions for too bad that I've seen before include "Informally regrettable - excessively wicked" , "That's regrettable, informally" , "regrettably" , "I have no sympathy" , "What a pity, hard luck" .)