Crossword Genius

Old priest is suppressing alien oaths (10)

Ross

I believe the answer is:

expletives

'oaths' is the definition.
(both can mean swearwords)

'old priest is suppressing alien' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'priest' becomes 'p' (ecclesiastical abbreviation).
'is' becomes 'lives'.
'suppressing' indicates putting letters inside.
'alien' becomes 'et' (extra terrestrial).
'lives' placed around 'et' is 'letives'.
'ex'+'p'+'letives'='EXPLETIVES'

I've seen this clue in The Guardian.
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