Significant lack of furniture? (7)
I believe the answer is:
notable
'significant' is the definition.
(I've seen this before)
'lack of furniture?' is the wordplay.
'lack of' becomes 'no' (lack of money is no money).
'furniture?' becomes 'table' (table is a kind of furniture).
'no'+'table'='NOTABLE'
(Other definitions for notable that I've seen before include "Outstanding" , "Prominent" , "VIP" , "Worth remembering" , "Striking" .)