Stationary arm that projects the shadow on a sundial (6)

I believe the answer is:

gnomon

(Other definitions for gnomon that I've seen before include "Sundial arm" , "Sundial rod" , "Pointer on a sundial" , "Pin of a sundial whose shadow points to the hour" , "Part of a sundial projecting a shadow" .)

I've seen this clue in The Mirror.

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