"I can't take it any longer!" (4)

I think it could be either:

Which length description are you looking for?:

stop

(Other definitions for stop that I've seen before include "Organ knob; get bus here" , "as per instruction" , "Knock out" , "Cease, desist, whoa" , "Part of organ" .)

I've seen this clue in The New York Times.

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