When using a live trap for clever animals, I try to find a place where I can use existing obstacles to steer the animal towards the entrance. If they can walk up to the outside of the food end of the trap, they seem to understand what is going on. Once you find a place with downed limbs, patio furniture, etc. you can start feeding the cat in that general area but keep moving the food bowl to different spots in that area so the cat gets used to looking for it and eating in a different place every night.