I turned out to be devoid of proven ability (7)

I believe the answer is:

untried

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Here is my best explanation:

'be devoid of proven ability' is the definition.
I can't tell whether this definition defines the answer.

'i turned out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'i'+'turned'='iturned'
'iturned' with letters rearranged gives 'UNTRIED'.

'to' acts as a link.

Can you help me to learn more?

This clue was last seen in The Times