Set super booster to 'loud' (12)
I believe the answer is:
obstreperous
'loud' is the definition.
(thesaurus)
'set super booster' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'super'+'booster'='superbooster'
'superbooster' anagrammed gives 'OBSTREPEROUS'.
'to' acts as a link.
(Other definitions for obstreperous that I've seen before include "Sober posture (anag) - unruly" , "Disruptive" , "Bolshie" , "Noisily aggressive" , "Noisily defiant" .)