Crossword Genius

Adrift, runs like bull (as opposed to cow)? (10)

Ross

I believe the answer is:

rudderless

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'adrift' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for rudderless that I've seen before include "Unable to provide guidance" , "Without steering mechanism" , "Lacking direction" , "Having lost control" , "not yielding power to steer" .)

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