Mat parent spread flat (9)
I believe the answer is:
apartment
'flat' is the definition.
(I know that flat can be written as apartment)
'mat parent spread' is the wordplay.
'spread' is an anagram indicator.
'mat'+'parent'='matparent'
'matparent' with letters rearranged gives 'APARTMENT'.
(Other definitions for apartment that I've seen before include "Flat (chiefly US)" , "place to live" , "Flat (mainly US)" , "quarters" , "pad" .)