Uproar as four turned on (6)
I believe the answer is:
furore
'uproar' is the definition.
(synonyms)
'four turned on' is the wordplay.
'turned' indicates anagramming the letters.
'on' becomes 're' ('on' can be mean 'with reference to').
'four' anagrammed gives 'furo'.
'furo'+'re'='FURORE'
'as' is the link.
(Other definitions for furore that I've seen before include "Hoo-ha" , "Sudden outburst, uproar" , "Commotion - public outburst - rage" , "Turmoil, uproar" , "To-do" .)