"Assuming that's true . . ." (2,2)

I think it could be either:

Which length description are you looking for?:

2,2

if so

'assuming that's true' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for if so that I've seen before include "Should that happen?" , "Assuming that's true" , "In that case ..." .)

I've seen this clue in the Wall Street Journal, the Sydney Morning Herald, The New York Times, the Newsday and the Universal.

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