Use a spade (3)

I think it could be either:

Which length description are you looking for?:

5 3*

'use a spade' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for dig that I've seen before include "Sly remark; excavate" , "Really like" , "Understand" , "criticism" , "Use a spade" .)

I've seen this clue in the USA Today, the LA Times, the King Feature Syndicate, the Evening Standard and The Mirror.

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