Piece of furniture one sits in daily (5)
I believe the answer is:
chair
'piece of furniture' is the definition.
(chair is a kind of piece of furniture)
'one sits in daily' is the wordplay.
'one' becomes 'i' (Roman numeral).
'sits in' is an insertion indicator.
'daily' becomes 'char' (I've seen this before).
'i' going inside 'char' is 'CHAIR'.
(Other definitions for chair that I've seen before include "Item of furniture (which can be addressed!)" , "Professorship" , "Windsor, for example" , "rocker?" , "Top seat of committee" .)