Crossword Genius

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

Ross

I believe the answer is:

aimless

'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" .)

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