Crossword Genius

Promise utter obscenities (5)

Ross

I believe the answer is:

swear

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'promise' is the definition.
(as in swearing something is true)

I can't explain the remainder of the clue.

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(Other definitions for swear that I've seen before include "Assert" , "Asseverate" , "Promise on oath" , "Use bad language" , "Avow" .)

I've seen this clue in The Sun.
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