It sounds like material for craftsperson, or painter (4)

I believe the answer is:

klee

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'painter' is the definition.
(I have seen 'Swiss painter ' mean 'klee' so perhaps 'painter' could also mean 'klee')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(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 Guardian.

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