Success in returning what's owed for furniture (4,3)
I believe the answer is:
twin bed
'furniture' is the definition.
(twin bed is a kind of furniture)
'success in returning what's owed' is the wordplay.
'success' becomes 'win' (I've seen this in another clue).
'in' indicates putting letters inside.
'returning' is a reversal indicator.
'what's owed' becomes 'debt' (I can't explain this - if you can you should believe this answer much more).
'debt' back-to-front is 'tbed'.
'win' inserted into 'tbed' is 'TWIN BED'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for twin bed that I've seen before include "One of a matching pair in a room for two" , "This may be found in a double room" , "One of a pair to sleep on" , "place for retirement" .)