As an example (3,8)

I think it could be either:

Which length description are you looking for?:

3,3

3,8

for instance

'as an example' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for for instance that I've seen before include "say" , "As an example" .)

I've seen this clue in The Mirror.

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