University dons huntin' marine creature (3,6)
I believe the answer is:
sea urchin
'marine creature' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sea urchin that I've seen before include "Marine invertebrate with spikes" , "Main thing" , "Marine creature with near-spherical spiny shell" , "prefers salt water" , "Echinoderm with a thin spiny globular shell" .)