Regulate unusually steamy sites (11)

I believe the answer is:

systematise

'regulate' is the definition.
('regulate'->'systematize' is in my internal thesaurus and 'ize'->'ise')

'unusually steamy sites' is the wordplay.
'unusually' indicates an anagram.
'steamy'+'sites'='steamysites'
'steamysites' anagrammed gives 'SYSTEMATISE'.

(Another definition for systematise that I've seen is " Put into organised form".)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app