Crossword Genius

An easy subject? (6)

Ross

I believe the answer is:

sitter

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'an easy subject?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is the entire clue.

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(Other definitions for sitter that I've seen before include "One posing for artist" , "A poser" , "Child-minder of sedentary disposition" , "broody type" , "Artist's model or child's minder" .)

I've seen this clue in the Evening Standard.
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