Solemn vow (4)

I believe the answer is:

oath

'solemn vow' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for oath that I've seen before include "gadzooks!" , "Solemn vow" , "Curse or solemn word" , "Swear word" , "Strong language" .)

I've seen this clue in The Telegraph, the USA Today, The Mirror, The Times, the Penny Press, the Universal and The Sun.

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