Crossword Genius

Part of an oil well, maybe (3)

Ross

I believe the answer is:

cap

(Other definitions for cap that I've seen before include "Better; hat" , "Set limit to price increase - of headgear?" , "One on head; excel" , "Covering for head or bottle" , "Flat brimless hat" .)

I've seen this clue in The New York Times.
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