Vow taken in boathouse (4)

I believe the answer is:

oath

'vow' is the definition.
(synonyms)

'taken in boathouse' is the wordplay.
'taken in' indicates the answer is hidden within the clue.
'OATH' is hidden in the letters of 'boathouse'.

(Other definitions for oath that I've seen before include "darn, for example" , "gadzooks!" , "Solemn pledge" , "Sworn promise" , "Curse - sworn statement" .)

I've seen this clue in The Sun.

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