Definitely something done at home (6)
I believe the answer is:
indeed
'definitely' is the definition.
(thesaurus)
'something done at home' is the wordplay.
'something done' becomes 'deed' (I've seen this before).
'at' means one lot of letters go next to another (I've seen this in other clues).
'home' becomes 'in' ('he's home' can mean 'he's in').
'deed' after 'in' is 'INDEED'.
(Other definitions for indeed that I've seen before include "Surely" , "''A friend in need is a friend . . . . . .''" , "Yes, truthfully" , "Actually -- denied (anag)" , "Certainly, quite so" .)