Scrap noted thrown around vacant dorm (7)
I believe the answer is:
oddment
'scrap' is the definition.
('oddment' can be a synonym of 'scrap')
'noted thrown around vacant dorm' is the wordplay.
'thrown' is an anagram indicator.
'around' means one lot of letters goes inside another.
'vacant' suggests removing the centre.
'dorm' with its centre removed is 'dm'.
'noted' anagrammed gives 'odent'.
'odent' going around 'dm' is 'ODDMENT'.
(Other definitions for oddment that I've seen before include "Piece left over, no match" , "Remnant" , "An isolated article, something left over" , "Scrap" , "Leftover piece" .)