Crossword Genius

Finish off looking round classy creature on bed (3,6)

Ross

I believe the answer is:

sea urchin

I'm a little stuck... Click here to teach me more about this clue!

'finish off looking round classy' is the definition.
I can't judge whether this definition defines the answer.

'creature on bed' is the wordplay.
'creature' becomes 'sea' (sea animal is a kind of animal).
'on bed' becomes 'urchin' (I can't explain this - if you can you should believe this answer much more).
'sea'+'urchin'='SEA-URCHIN'

Can you help me to learn more?

(Other definitions for sea urchin that I've seen before include "Marine animal with globular body" , "spineless creature" , "Marine creature with near-spherical spiny shell" , "Marine life form" , "A problem for barefoot dabblers" .)

I've seen this clue in The Times.
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