Best Picture winner that becomes an earlier Best Picture nominee when an "F" is added to the front (4)

I believe the answer is:

argo

(Other definitions for argo that I've seen before include "Jason's legendary ship" , "Old sailing vessel" , "Ship Jason sailed to find the Golden Fleece" , "Constellation; ship" , "Mythical ship" .)

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

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