Oh, even Luther converted in final moments (8,4)

I believe the answer is:

eleventh hour

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'oh even luther converted in final moments' is the definition.
I can't judge whether this defines the answer.

'oh even luther converted' is the wordplay.
'converted' indicates an anagram.
'oh'+'even'+'luther'='ohevenluther'
'ohevenluther' anagrammed gives 'ELEVENTH-HOUR'.

Can you help me to learn more?

(Other definitions for eleventh hour that I've seen before include "Latest possible time" , "Last minute" , "Latest possible moment" , "well before noon" , "Last-minute" .)

I've seen this clue in The Everyman puzzle in The Observer.

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