Understanding response (1,3)

I think it could be either:

Which length description are you looking for?:

1,3

i see

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

This is all the clue.

(Other definitions for i see that I've seen before include "Got it now!" , "So that's the way the cookie crumbles!" , "Expression of dawning comprehension" .)

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