Undergraduate wrapped up ring in scarf (3)
I believe the answer is:
boa
'scarf' is the definition.
(boa is a kind of scarf)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for boa that I've seen before include "Wrap" , "Fluffy scarf of feathers" , "Large snake provides a neck decoration" , "One with scaly body" , "S American snake that crushes its prey" .)