Something to think about? (2,4)

I think it could be either:

Which length description are you looking for?:

2,4

idea

'something to think about' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for idea that I've seen before include "Plato's Form is" , "intellectual product" , "Inkling" , "Notion, concept" , "It comes to mind" .)

I've seen this clue in the Universal and The New York Times.

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