Crossword Genius

Formerly in concert (4)

Ross

I believe the answer is:

once

'formerly' is the definition.
(synonyms)

'in concert' is the wordplay.
'in' says the answer is hidden in the clue.
'ONCE' is hidden within 'concert'.

(Other definitions for once that I've seen before include "Some time back" , "On one occasion" , "in bygone era" , "Cone (anag.)" , "Sometime" .)

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