Word of honor (3)

I think it could be either:

Which length description are you looking for?:

vow

'word of honor' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for vow that I've seen before include "Promise, swear" , "Plight" , "Pledge, take oath" , "Binding promise" , "Solemn pledge" .)

I've seen this clue in The Wall Street Journal.

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