As it turns out, EEC did determine it (6)

I believe the answer is:

decide

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'as it turns' is the definition.
I can't tell whether this defines the answer.

'eec did determine it' is the wordplay.
'eec did' anagrams to 'DECIDE'.
But, I'm not clear how this is indicated.

'out' is the link.

Can you help me to learn more?

(Other definitions for decide that I've seen before include "Resolve; give judgement" , "Conclude" , "Adjudicate" , "Settle conclusively" , "Reach a conclusion" .)

I've seen this clue in The Irish Times.

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