Crossword Genius

What can control large tour going round? (9)

Ross

I believe the answer is:

regulator

'what can control' is the definition.

'large tour going round?' is the wordplay.
'going round?' is an anagram indicator.
'large'+'tour'='largetour'
'largetour' anagrammed gives 'REGULATOR'.

(Other definitions for regulator that I've seen before include "Such as OFGAS, OFTEL etc" , "Governor" , "source of rules?" , "Supervisor" , "Ofsted perhaps" .)

I've seen this clue in The Times.
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