Crossword Genius

Act One goes wrong immediately (2,4)

Ross

I believe the answer is:

at once

'immediately' is the definition.
(thesaurus)

'act one goes wrong' is the wordplay.
'goes wrong' is an anagram indicator.
'act'+'one'='actone'
'actone' anagrammed gives 'AT ONCE'.

(Other definitions for at once that I've seen before include "A no etc (anag)" , "Immediately, this instant" , "Right now, this instant" , "'Immediately (2,4)'" , "This instant, hop to it" .)

I've seen this clue in The Telegraph.
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