Crossword Genius

Keeping one's thoughts to oneself, say (9)

Ross

I believe the answer is:

secretive

(Other definitions for secretive that I've seen before include "Very private" , "withdrawn" , "Tending to hide things" , "Inclined to concealment" , "Tight-lipped, reticent" .)

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