Annoyed at parent taking 1000 for flat (9)
I believe the answer is:
apartment
'flat' is the definition.
('apartment' can be a synonym of 'flat')
'annoyed at parent taking 1000' is the wordplay.
'annoyed' indicates an anagram.
'taking' means one lot of letters goes inside another.
'1000' becomes 'm' ('m' can be a synonym of '1000').
'at'+'parent'='atparent'
'atparent' anagrammed gives 'apartent'.
'apartent' placed around 'm' is 'APARTMENT'.
'for' is the link.
(Other definitions for apartment that I've seen before include "quarters" , "Flat (chiefly US)" , "place to live" , "pad" , "property" .)