Typewriter key (3)

I think it could be either:

Which length description are you looking for?:

tab

'typewriter key' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tab that I've seen before include "Tally of orders in bar" , "Ring pull" , "Till bill" , "ticket" , "Flap; illicit drug pill (slang)" .)

I've seen this clue in The Star Tribune.

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