It's put around for the sake of appearance (6)
I believe the answer is:
bangle
'appearance' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bangle that I've seen before include "Item of jewellery" , "Ornamental arm or leg band" , "Ornament for arm or ankle" , "Metal armband" , "displaying charm perhaps" .)