The —, 1964 film drama starring Henry Fonda and Cliff Robertson (4,3)

I believe the answer is:

best man

(Other definitions for best man that I've seen before include "Key union facilitator r" , "Groom's primary attendant at wedding" , "Groom's friend" , "May he win!" , "The groom's assistant at a wedding" .)

I've seen this clue in The Mirror.

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