Debt is getting out of hand in flat (6)
I believe the answer is:
bedsit
'flat' is the definition.
(bedsit is a kind of flat)
'debt is getting out of hand' is the wordplay.
'getting' says to put letters next to each other.
'out of hand' indicates an anagram.
'debt'+'is'='debtis'
'debtis' with letters rearranged gives 'BEDSIT'.
'in' acts as a link.
(Other definitions for bedsit that I've seen before include "Single room lodging" , "property" , "Minimal accommodation" , "rented accommodation" , "Room to accommodate" .)