Top dog, for short (3)

I believe the answer is:

ceo

'top dog for short' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ceo that I've seen before include "Initially, top man in an organisation" , "Initials commonly used for top boss" , "Initially, the top boss" .)

I've seen this clue in the Newsday.com and The New York Times.

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