Crossword Genius

Like canned sardines and olives, typically (4)

Ross

I believe the answer is:

oily

(Other definitions for oily that I've seen before include "Like a lot of fish" , "Covered in lubricant" , "Smarmy" , "Unpleasantly ingratiating" , "Smooth; like lubricant" .)

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