Possible Clues:

• One poses to rest it afresh
• Catch one in a chair
• Necessity for some, in order to go to the movies
• A model parent surrogate
• You can't miss it, notwithstanding the artist may have one
• He won't stand for being portrayed
• Childminder becomes a model
• Easy shot for the portrait
• Sedentary child minder
• A piece of cake for person at table