10 across
Having
special
powers
but
uncrowned,
like
ancient
Greeks
(5)
Having special powers but uncrowned, like ancient Greeks (5)
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The definition is at the end of the clue.
How the clue works
Like ancient Greeks is your definition — the Ionic people of antiquity. BIONIC gives you 'having special powers', and then 'uncrowned' lops off the first letter (the B), leaving you with what you need.