Crossword Genius

OK bloke (5)

Ross

I believe the answer is:

roger

I'm a little stuck... Click here to teach me more about this clue!

'ok' 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 roger that I've seen before include "Message received; name" , "that's clear" , "Expression of agreement" , "Message received and understood!" , "R in telecommunications" .)

I've seen this clue in The Daily Express and The Mirror.
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