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Marine echinoderm (3,6)

Ross

I think it could be either:

Which length description are you looking for?:

8

3,6

sea urchin

'marine echinoderm' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sea urchin that I've seen before include "Marine invertebrate with spikes" , "Shelled marine creature" , "Marine life form" , "Marine creature with near-spherical spiny shell" , "Marine invertebrate - enrich USA (anag)" .)

I've seen this clue in The Times.
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