Crossword Genius

I hear you, Mister Federer! (5)

Ross

I believe the answer is:

roger

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'i hear you' is the definition.
(radio communications)

I cannot understand how the remainder of the clue works.

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(Other definitions for roger that I've seen before include "Chap" , "Received (in radio comms)" , "Military 'OK'" , "Sir - de Coverley, English country dance" , "- - Moore (007)" .)

I've seen this clue in The Telegraph.
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