Bringing up the rear (4)

I think it could be either:

Which length description are you looking for?:

last

'bringing up the rear' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for last that I've seen before include "Continue" , "` `Let the cobbler stick to his ....' '" , "The cobbler's equipment will endure" , "` `The cobler should stick to his ....' '" , "Ultimate - endure" .)

I've seen this clue in the Universal.

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