Crossword Genius

Clever chap, Robert Stephenson? (6,9)

Ross

I believe the answer is:

rocket scientist

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'clever chap' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for rocket scientist that I've seen before include "Mastermind" , "I launch farreaching studies" , "brain" , "boffin" , "Clever chap" .)

I've seen this clue in The Telegraph.
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