Vane noun – The flattened weblike part of a feather consisting of a series of barbs on either side of the shaft. Weathercock and vane are semantically related in finned device topic. In some cases you can use "Weathercock" instead a noun "Vane".
The correct position for 'fin' is the only possible 3-letter position that starts with a singleton (i.e. the only occurrence of that letter in the puzzle.)
Many thanks to geevo41 who worked it out so quickly.
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