Subjects the artist is unlikely to drop?

I believe the answer is:

sitters

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'subjects' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for sitters that I've seen before include "Models" , "Easy catches" .)

I've seen this clue in the Evening Standard.

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