A piece of ribbon usually is a nice something extra (5)
I believe the answer is:
bonus
'something extra' is the definition.
(I've seen this in another clue)
'a piece of ribbon usually is a' is the wordplay.
'a piece of' indicates a hidden word.
'BONUS' is hidden within 'ribbon usually a'.
'nice' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bonus that I've seen before include "Payment additional to the expected or usual" , "Additional payment or benefit above the norm" , "Good-performance payment" , "Honorarium" , "Extra dividend" .)