Crossword Genius

Out to lunch in New York eating sandwich with no crust (5)

Ross

I believe the answer is:

nutty

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'out to lunch' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nutty that I've seen before include "Like brazils, say" , "Crunchy" , "Crazy - slack?" , "Like cobs, brazils, etc" , "Round the bend?" .)

I've seen this clue in The Times.
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