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Ignore heart on cuckoo's wings — impossible! (2,3,2)

Ross

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7

2,3,2

no can do

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'impossible' is the definition.
('no can do' can mean something is impossible)

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

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(Other definitions for no can do that I've seen before include "Can't manage it, see doc anon" , "That's out of the question!" , "Unable to help" , "Impossible, I'm afraid!" , "off-putting response" .)

I've seen this clue in The Guardian.
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