Bear: one sits regularly for surrealist (5)

I believe the answer is:

ernst

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

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

(Other definitions for ernst that I've seen before include "Young partner" , "Max __; Dadaist" , "German-born painter, Max, co-founder of dadaism, d. 1976" , "Max -, twentieth century German Surrealist artist" , "artist's name" .)

I've seen this clue in The Sun.

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