Crossword Genius

Mastermind running riot in Greene (8)

Ross

I believe the answer is:

engineer

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

'mastermind running' is the definition.
'engineer' can be an answer for 'mastermind' (both can mean to contrive or plot something). I am unsure of the 'running' bit.

'riot in greene' is the wordplay.
'riot' indicates anagramming the letters.
'in'+'greene'='ingreene'
'ingreene' with letters rearranged gives 'ENGINEER'.

Can you help me to learn more?

(Other definitions for engineer that I've seen before include "Professional who may be civic, electrical or mechanical" , "US or Canadian train driver" , "One uses scientific knowledge to solve practical problems" , "Designer of machines etc" , "Train driver, say" .)

I've seen this clue in The Sun.
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