Cephalopod mollusc (8)

I think it could be either:

Which length description are you looking for?:

nautilus

'cephalopod mollusc' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for nautilus that I've seen before include "Cephalopod mollusc" , "Nemo's vessel" , "Nemo's sub (Verne)" , "Spiral-shelled mollusc" , "Mollusc and first nuclear-powered submarine" .)

I've seen this clue in The Times.

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