I’ve found a large chalk arrow carved into scrubland east of Dundee, Scotland.
Grateful if someone more knowledgable could tag it / redo it such that it renders on the map. thx.
I don’t know if the remains of this former arrow must be rendered in carto. Depending on the aerial imagery used it is hard to be spotted at all and even harder to be identified as an arrow. One would need the eyes of an eagle to spot this blurred shape from a plane flying in a reasonable height. I would hesitate to map it at all.
Maybe a geoglyph? It won’t render in the most popular styles, but that’s life.
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With geoglyphs, it’s funny how people seem to work around that 
At least one renderer admits to handling it other than as a “hole” in something else (mine - see e.g. here) but I suspect that there are actually more.
However, your original suggestion for an aeroway feature sounds nearer the mark to me, like here for the famous ones in the USA (see external links here for that example and here more generally). The relevant taginfo page is probably here - it does look like there is some support (though not in general purpose maps such as the ones on the main osm.org site, obviously).
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