Fast travel back to the mission marker in Parker Square. After the scene, you have to escape your motel room hideout and protect Clara. Take out the first gunner holding Clara then head outside. More fixers will be waiting there so use your rifle and focus to take them out. Stick close to Clara and stay in cover as you continue eliminating the enemy reinforcements.
Continue moving forth and escort Clara to her car. Take out the last remaining enemies then escape the motel area to complete the mission.