It may be sworn round at hotel (4)

I believe the answer is:

oath

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'it may be sworn' is the definition.
The definition suggests a singular noun which matches the answer.

'round at hotel' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'o'+'at'+'h'='OATH'

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(Other definitions for oath that I've seen before include "Curse or solemn promise" , "word intended?" , "Courtroom promise" , "Vow or expletive" , "Curse or solemn word" .)

I've seen this clue in The Times.

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