Crossword Genius

Positioned with prejudice … Boatman is excluded (5)

Ross

I believe the answer is:

based

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'positioned' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for based that I've seen before include "Founded, grounded" , "Worthless" , "Stationed (in a place)" , "(Of aircraft) stationed" , "Established" .)

I've seen this clue in The Guardian.
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