I say - it rhymes! (3)

I believe the answer is:

hey

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'i say' is the definition.
Both the answer and definition are interjections.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for hey that I've seen before include "Exclamation calling attention" , "Call attracting attention" , "Exclamation to call attention" .)

I've seen this clue in the Evening Standard.

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