Circus pioneer, d. 1891 (6)

I believe the answer is:

barnum

(Other definitions for barnum that I've seen before include "US showman, Bailey's partner" , "Man who was responsible for entertaining" , "With Bailey, he ran a famous circus" , "US showman who popularized the circus" , "Bailey's circus partner, d. 1891" .)

I've seen this clue in The Guardian.

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