"If all ___ fails . . ." (4)

I believe the answer is:

else

(Other definitions for else that I've seen before include "Alternatively" , "Adverb meaning if not, otherwise" , "In addition, besides" , "Eels (anag)" , "Besides, otherwise" .)

I've seen this clue in the USA Today, The New York Times, the LA Times, the Universal and the Newsday.

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