We should put up a standing stone! (5)

I believe the answer is:

stela

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'standing stone' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for stela that I've seen before include "Ancient column" , "Standing stone" , "Inscribed column" , "Upright stone slab" , "People having digs" .)

I've seen this clue in The Times.

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