Promise That One Will Crossword Clue — 5 Letters

One confident answer with explanation of the wordplay

SWEAR

Possible

S

W

E

A

R

"Promise that one will" — to SWEAR (an oath) is to solemnly promise or vow that something will happen. "Swear that one will" fits naturally as a definition of making a solemn promise.

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Other possible answers

VOUCHTo vouch can mean to promise or guarantee, though typically 'vouch for' someone rather than 'that one will'.

VOWEDVOWED means promised solemnly, but as past tense it may not fit the clue's present tense implication.

SWOREPast tense of swear — made a solemn promise — could fit if the clue implies past action.

PLEADLess likely, but pleading can imply promising earnestly.

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