In total sobriety as well (4)

I believe the answer is:

also

'as well' is the definition.
(synonyms)

'in total sobriety' is the wordplay.
'in' says the answer is hidden in the clue.
'ALSO' is hidden within 'total sobriety'.

(Other definitions for also that I've seen before include "Likewise" , "Plus" , "Item" , "As well, in addition" , "in accompaniment" .)

I've seen this clue in The Daily Express and The Mirror.

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