Suddenly (3,2,4)

I think it could be either:

Which length description are you looking for?:

3,2,4

all at once

'suddenly' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in The Guardian and The Independent.

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