Crossword Genius

Ruddy German after making U-turn tailgates German car, I hear (7)

Ross

I believe the answer is:

auditor

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'i hear' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for auditor that I've seen before include "Account inspector" , "I'll check expense involved" , "I hear" , "Accountant - listener" , "One reviewing books" .)

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