Make a pick (3)

I think it could be either:

Which length description are you looking for?:

6 3*

'make a pick' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for opt that I've seen before include "End or act of shutting" , "Choose from pot" , "Elect" , "Decide between possibilities, choose" , "Make a choice" .)

I've seen this clue in the Universal, The New York Times and The Wall Street Journal.

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