Again relative turned up (3)

I believe the answer is:

bis

'again' is the definition.
(thesaurus)

'relative turned up' is the wordplay.
'relative' becomes 'sib' (sib is a kind of relative).
'turned up' is a reversal indicator.
'sib' written backwards gives 'BIS'.

(Other definitions for bis that I've seen before include "second time" , "To be repeated (music)" .)

I've seen this clue in The Times.

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