Undergraduate wrapped up ring in scarf (3)

I believe the answer is:

boa

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'scarf' is the definition.
(boa is a kind of scarf)

I cannot understand how the remainder of the clue works.

(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" .)

I've seen this clue in The Mirror.

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