Stage One is timed out and sanctioned (11)

I believe the answer is:

legitimised

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'and sanctioned' is the definition.
I can't tell whether this defines the answer.

'stage one is timed out' is the wordplay.
'stage' becomes 'leg' (a leg is a stage of a competition).
'one' becomes 'i' (Roman numeral).
'out' indicates putting letters inside.
'is' going within 'timed' is 'timised'.
'leg'+'i'+'timised'='LEGITIMISED'

Can you help me to learn more?

(Other definitions for legitimised that I've seen before include "Validated" , "Made to conform to the law" .)

I've seen this clue in the Sydney Morning Herald.

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