"But of course!” (2,3)

I think it could be either:

Which length description are you looking for?:

2,3

natch

'but of course' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for natch that I've seen before include "Of course, commonly < , behind" , "obviously" , "a display of Indian dancing" , "Of course! (US sl.)" .)

I've seen this clue in the Penny Press.

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