Just can i use in the same encounter phase the clue I got and the one created after by the camera (or such an operation is illegal cause I have to spend 2 of them in the exact same moment and camera create a second clue after i spend first).
No, you can't do that. In your example you cannot spend the first Clue because you want to use it for a purpose which requires two Clues. To pay a cost, you must have all of the resources available, and that is not the case in your situation: you have 1 Clue but need 2. You don't gain the Clue from the Camera until after you have spent the Clue which triggers the Camera. You cannot pay a "partial cost" to trigger that effect.