Crossword Genius

En masse and without warning (3,2,4)

Ross

I believe the answer is:

all at once

I believe this clue is a double definition.

'en masse' is the first definition.
(thesaurus)

'without warning' is the second definition.
(thesaurus)

'and' acts as a link.

(Other definitions for all at once that I've seen before include "Together" , "Without warning" , "Simultaneously - immediately" , "Suddenly" , "How daffodils appeared to Wordsworth" .)

I've seen this clue in the Evening Standard.
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