Crossword Genius

Ring secured by wing nut? (6)

Ross

I believe the answer is:

washer

(Other definitions for washer that I've seen before include "Seal to prevent leakage" , "Joint-sealing ring" , "Ring placed between two surfaces to prevent leakage, as in tap" , "Perhaps laundryman" , "Tap seal" .)

I've seen this clue in The Guardian.
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