Crossword Genius

Hollow center? (3)

Ross

I believe the answer is:

els

'hollow center?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for els that I've seen before include "Golfer; elevated railways" , "US urban railways" , "South African golfer" , "Angular distances above the horizon" , "Ernie - - (golfer)" .)

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