Din is one problem (5)
I believe the answer is:
noise
'din' is the definition.
(a din is a noisy disturbance)
'is one problem' is the wordplay.
'problem' indicates an anagram.
'is'+'one'='isone'
'isone' with letters rearranged gives 'NOISE'.
(Other definitions for noise that I've seen before include "Confused sounds" , "Kind of pollution" , "Sound of any kind" , "Sound, disagreeable perhaps" , "Loud sound; bruit" .)