Timid about dreadful din or disturbance (6)
I believe the answer is:
shindy
'disturbance' is the definition.
(I've seen this before)
'timid about dreadful din' is the wordplay.
'timid' becomes 'shy' ('shy' can be similar in meaning to 'timid').
'about' is an insertion indicator.
'dreadful' indicates an anagram.
'din' anagrammed gives 'ind'.
'shy' placed around 'ind' is 'SHINDY'.
'or' is the link.
(Other definitions for shindy that I've seen before include "Rumpus (colloq.)" , "disorderly party" , "racket" , "quarrel" , "Large lively party" .)