Use a timer behavior on your sprite. When you click it, start the timer. When the timer completes, destroy the object. If you let go of the mouse button or move off the object, stop the timer so it never completes.
+ Mouse: On Left button Clicked on Sprite
-> Sprite: Start Timer "countdown" for 1.0 (Once)
+ Mouse: On Left button released
+ Sprite: Is Timer "countdown" running
-> Sprite: Stop Timer "countdown"
+ Sprite: Is Timer "countdown" running
+ Mouse: [X] Cursor is over Sprite
-> Sprite: Stop Timer "countdown"
+ Sprite: On Timer "countdown"
-> Sprite: Destroy