"What happened next?” (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

and

'what happened next?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for and that I've seen before include "Joiner or dandies" , "It connects words, clauses or sentences" , "Joining word" , "Also" , "Together with" .)

I've seen this clue in The Wall Street Journal.

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