Uproar at home? Smarten up the mess, say (6,4)
I believe the answer is:
dining room
'the mess say' is the definition.
(mess is a kind of dining room)
'uproar at home? smarten up' is the wordplay.
'uproar' becomes 'din' (I've seen this in other clues).
'at home?' becomes 'in' ('in' can be similar in meaning to 'at home').
'smarten up' becomes 'groom' (I've seen this before).
'din'+'in'+'groom'='DINING-ROOM'
(Other definitions for dining room that I've seen before include "eating-place" , "Where meals are eaten" , "refectory" , "place for courses?" , "mess" .)