"___ Elementary" (sitcom set in Philadelphia) (6)

I believe the answer is:

abbott

(Other definitions for abbott that I've seen before include "Bud ... and Lou Costello" , "Costello's comedy partner" , "one of a comic duo" , "Double act partner of Lou Costello" , "Costello's film partner" .)

I've seen this clue in The Washington Post.

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