Surveying instrument (10)

I believe the answer is:

theodolite

'surveying instrument' is the definition.
(theodolite is a kind of surveying instrument)

This is all the clue.

(Other definitions for theodolite that I've seen before include "Surveyor's instrument" , "What a surveyor might use" , "transit, in America" , "Surveying instrument" .)

I've seen this clue in The New Yorker, the Thinks.com and The Guardian.

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