Getting Distance Between Mouse Click and Actor

I am trying to simply calculate the distance (in whatever arbitrary unit is necessary) between my mouse click and the location of my actor in the scene (a ‘find the prey’ style format). This may be zero (if ‘successful’, as the click will be on the actor’s location) or a larger integer (when the click is further away from the actor).

The screenshot shows the numerous ways I have tried to do this e.g. break hit result, get mouse position, the get distance node (from MorePork Functions library) and the vector-vector plus vector length. No method has printed anything other than 0.0…

Any help/suggestions?