Crossword Genius

Cuckoo with intention of feeding? (3,2,5)

Ross

I believe the answer is:

out to lunch

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(Other definitions for out to lunch that I've seen before include "Temporarily removed from office" , "Sign on shopkeeper's door" , "Slightly crazy - not eating in" , "stupid" , "unbalanced" .)

I've seen this clue in The Times.
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