She's in peak form in Crete (3)

I believe the answer is:

ida

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'in crete' is the definition.
(I know that Ida located in the administrative territorial entity Crete)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ida that I've seen before include "Poetic princess" , "Industry development group" , "Classical mountain" , "musical princess" , "Cretan mount" .)

I've seen this clue in The Globe and Mail.

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