Extremely, informally (5)

I think it could be either:

Which length description are you looking for?:

way

'extremely informally' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for way that I've seen before include "Manner; road" , "Method; route" , "Street" , "'Manner, mode (3)'" , "Path" .)

I've seen this clue in The Wall Street Journal.

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