Dirty Fighting doesn't specify "at your location" so ... you can trigger Doppelgänger to evade an enemy from an other location and then trigger Dirty Fighting to fight it, right ? Even if this enemy is Aloof.

On the opposite, Lucius Galloway gets the clue at his location.

I think a more standard use is to put it in a deck that gets clues thanks to the presence of an enemy (Fake Credentials, Followed, ...) : you lay Doppelgänger on high-shroud locations and when an enemy enters one of them, you teleport there to try to get the clues. And you can eventually combine it with Obscure: teleport to the location, engage, evade, and then get your clues.

Edit: As indicated below, you can't fight from an other location with Dirty Fighting if you don't have an effect that allows you to fight from an other location.

There's enormous flexibility here. For example, you could tuck one of these on the same location as the clue-ver and immediately pop in when an enemy shows up to menace them. I think the best value here is if all of the options could potentially be useful.

That said, Easy Mark is more generically beneficial if you are looking for a Myriad Trick to put on Bewitching and trigger a few deck-thinning searches.