Thought I had Eva, but she lost heart (4)

I believe the answer is:

idea

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'thought' is the definition.
(I know that thought can be written as idea)

I can't explain the remainder of the clue.

(Other definitions for idea that I've seen before include "Proposal" , "Thought or notion (4)" , "Creative spark" , "Thought, conception" , "Plato's Form is" .)

I've seen this clue in The Irish News.

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