Picked up medium for sculptor or modern artist (4)

I believe the answer is:

klee

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'artist' is the definition.
(painter Paul Klee, 1879-1940)

I can't explain the remainder of the clue.

(Other definitions for klee that I've seen before include "Paul - - , Swiss painter" , "Paul --, Swiss surrealist" , "Auction offerer" , "Paul ---, Swiss artist" .)

I've seen this clue in The Times.

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