Crossword Genius

"When all __ fails . . ." (4)

Ross

I believe the answer is:

else

(Other definitions for else that I've seen before include "Besides; instead" , "Otherwise; different from" , "In addition; different" , "Eels (anag)" , "Adverb meaning if not, otherwise" .)

I've seen this clue in the Newsday.
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