Crossword Genius

Powerless to choose one's course? (6)

Ross

I believe the answer is:

adrift

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'course?' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for adrift that I've seen before include "'Directionless, floating freely (6)'" , "Undirected" , "Not anchored, floating freely" , "Floating uncontrolled" , "Wandering aimlessly" .)

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