Crossword Genius

"The probability that we may fail in the struggle ought not to ____ us from the support of a cause” (Abraham Lincoln) (5)

Ross

I believe the answer is:

deter

(Other definitions for deter that I've seen before include "Put off (from an action)" , "Cause not to do something" , "Hinder, prevent" , "Discourage through fear of consequences" , "Put (someone) off" .)

I've seen this clue in The Times.
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