Lettuce type (3)

I think it could be either:

Which length description are you looking for?:

cos

'lettuce type' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for cos that I've seen before include "Lettuce with long crisp leaves" , "leaves > function" , "Chief of Staff" , "Greek island and type of lettuce" , "Salad ingredient" .)

I've seen this clue in the Penny Press.

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