Furniture item till now is lacking base (4)
I believe the answer is:
sofa
'furniture item' is the definition.
(sofa is a type of furniture)
'till now is lacking base' is the wordplay.
'till now' becomes 'so far' (I've seen this in another clue).
'is lacking base' means to remove the last letter.
'sofar' with its last letter taken off is 'SOFA'.
(Other definitions for sofa that I've seen before include "Upholstered seat for more than one person" , "Item of furniture" , "Living room seat" , "Somewhere to sit" , "Comfy piece of furniture" .)