Find all the items that would be available to you on easy mode on hard/survivor/grounded difficulty. You will need to do this whenever the game loads a new area otherwise you will only find items that would be there on the original difficulty you selected. Also make sure when you change the difficulty to easy that you don't press X, change the difficulty to easy and then back to the difficulty you started the game with and press O.
This enemy is in the earliest stage of the fungal infection and still have their vision, they tend to hunt in groups so it is advised to stay out of their sight. If you do get captured press R2 to break free and run to safety. All types of attacks (Ranged, Melee or Stealth) are effective against this enemy.
A good strategy to get past an infected Clicker is to make a noise or throw a brick or a bottle to distract them. If you do find yourself in ranged combat you will need at least two head shots to take it down.