One is creating a din (5)
I believe the answer is:
noise
'a din' is the definition.
(thesaurus)
'one is creating' is the wordplay.
'creating' indicates an anagram.
'one'+'is'='oneis'
'oneis' anagrammed gives 'NOISE'.
(Other definitions for noise that I've seen before include "Din, cacophony" , "Row" , "Uproar" , "Racket, din" , "Sound - gossip" .)