Slips into conversation: 'Cistern jet's faulty' (10)

I believe the answer is:

interjects

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'slips into conversation' is the definition.
I can't tell whether this defines the answer.

'cistern jet's faulty' is the wordplay.
'faulty' indicates anagramming the letters.
'cistern'+'jet'='cisternjet'
'cisternjet' is an anagram of 'INTERJECTS'.

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I've seen this clue in The Everyman puzzle in The Observer.

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