Unimportant stuff provided by four during short hearing (6)
I believe the answer is:
trivia
'unimportant stuff' is the definition.
(trivial matters)
'four during short hearing' is the wordplay.
'four' becomes 'IV' (Roman numerals).
'during' means one lot of letters goes inside another.
'short' means to remove the last letter.
'hearing' becomes 'trial' (I've seen this before).
'trial' with its last letter removed is 'tria'.
'iv' inserted into 'tria' is 'TRIVIA'.
'provided by' is the link.
(Other definitions for trivia that I've seen before include "Matters very little" , "Unimportant things, minor matters" , "Unimportant information" , "Small beer" , "Things of little importance" .)