Chair wheel (6)

I believe the answer is:

caster

(Other definitions for caster that I've seen before include "Founder; type of 12 Ac" , "Crates with kind of fine sugar" , "Swivelling wheel (E, not O)" , "Small swivelling wheel on furniture" , "One who throws something" .)

I've seen this clue in The Telegraph, the King Feature Syndicate and the New York Times.

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