Further to the above:
I deleted Tor from Plank. Then went to open Tor from the main menu again. This time, weirdly, it showed on Plank and with the correct icon.
See below:
So, to reiterate exactly what I did and in what order:
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Started Plank
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Started Tor from main menu. Nothing extra appeared in Plank
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Dragged and dropped Tor icon from main menu onto plank. At which point correct Tor icon appeared on Plank. Also started and closed Tor from Plank. Tor icon remained on Plank after closing Tor.
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Deleted Tor icon from Plank
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Started Tor from main menu again and now correct Tor icon appeared on Plank. Closed Tor and Tor icon disappeared from Plank