Time-telling device that features a gnomon (7)

I believe the answer is:
sundial
(Other definitions for sundial that I've seen before include "Old timer?" , "Times given by this" , "Garden timepiece" , "Indicator of time" , "Natural timekeeper" .)
I believe the answer is:
sundial
(Other definitions for sundial that I've seen before include "Old timer?" , "Times given by this" , "Garden timepiece" , "Indicator of time" , "Natural timekeeper" .)