All features/activities available to the player in the Holland Nights mission.
You don't have to get into a gunfight with Clarence's men. At the end of a telephone conversation with Francis, you can go into an alley with a construction crane. We need to climb on the crane boom and prepare a sniper rifle. One shot - mission completed. The disadvantage of this method is that leaving alive and meeting Clarence as a random passerby (after completing the Blood Brothers mission) will not work. So - if you want to pardon Clarence and meet him again (I will say frankly that you should not expect anything good from a subsequent meeting with him), you need to join the battle.
A small note (to the alternative way of passing - climb on the crane boom and headshot Clarence): after completing the mission in this way, the player will not receive wanted stars; those. You can try to shoot Clarence with a sniper rifle and from the street (without climbing on the crane boom), but when completing the mission in this way, you will have to get rid of police pursuit.