Crossword Genius

Hold fast (6)

Ross

There are a few possibilities for this:

(Other definitions for pinion that I've seen before include "Confine - flight feather - cog" , "Outer segment of bird's wing" , "Immobilize" , "Restrain by holding, or bird's wing" , "Cogwheel; part of wing" .)

I've seen this clue in The Wall Street Journal, The Telegraph, the Penny Press, The Sun and the Evening Standard.
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