The Clippers will be one of many teams in the market for a new head coach this summer, and sources say they’ve already started doing their homework on one sensible candidate: Mark Jackson. Jackson’s supporters in the league have been telling the Clippers not to fear his lack of experience, given the success of previous inexperienced hires such as Rivers and Avery Johnson. They also are touting Jackson as being capable of lighting a fire beneath underachieving point guard Baron Davis. Of course, not much homework is necessary on Jackson. Clippers GM Neil Olshey, like Jackson, grew up in Queens, N.Y., and they’ve known each other since elementary school.