He’s willing to try to get the list back (8)
I believe the answer is:
testator
'he's willing' is the definition.
(I've seen this before)
'try to get the list back' is the wordplay.
'try' becomes 'test' (test is a kind of try).
'to get the list' becomes 'rota' (I can't justify this - if you can you should believe this answer much more).
'back' says the letters should be written in reverse.
'rota' reversed gives 'ator'.
'test'+'ator'='TESTATOR'
'to' is the link.
Can you help me to learn more?
(Other definitions for testator that I've seen before include "Person who has made a will" , "Will signatory" , "One leaving" , "Attestor (anag.)" , "Person making a will" .)