If you can break some records, it gives a good appearance (5)
I believe the answer is:
decor
'appearance' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for decor that I've seen before include "Internal ornamentation" , "Colour scheme, furnishing etc. of a room" , "Style of furnishings, drapes etc used in a room" , "Furnishings and colours of a room" , "stage background" .)