Crossword Genius

With no goals, direct girl to sub American for European (7)

Ross

I believe the answer is:

'with no goals' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for aimless that I've seen before include "Melissa (anag) -- unmotivated", "Like characters in 5D {WAITING FOR GODOT]", "Drifting - Melissa (anag)", "Lacking purpose", "Rambling".)