Rocket engineer keeps pacing around Orpington, perhaps (10)

I believe the answer is:

stephenson

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'rocket engineer' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for stephenson that I've seen before include "Loco engineer" , "man of note" , "George --, rail pioneer" , "Train man" , "Loco inventor" .)

I've seen this clue in The Independent.

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