Final anagram could be attempted when all else has failed? (4,6)
I believe the answer is:
last resort
'be attempted when all else has failed?' is the definition.
I can't judge whether this defines the answer.
'final anagram' is the wordplay.
'final' becomes 'last' (synonyms).
'anagram' becomes 'resort' (I can't explain this - if you can you should give a lot more credence to this answer).
'last'+'resort'='LAST RESORT'
'could' is the link.
Can you help me to learn more?
(Other definitions for last resort that I've seen before include "Final expedient" , "when everything else has failed?" , "When all else fails, try this" .)