Crossword Genius

Controlling device (9)

Ross

I believe the answer is:

regulator

'controlling device' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for regulator that I've seen before include "Of body" , "Ofsted perhaps" , "part of the watch" , "Controller" , "source of rules?" .)

I've seen this clue in the Sydney Morning Herald.
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