One man cuts film out -- losing all extreme characters -- and finally appreciates Finding Nemo's craft (8)

I believe the answer is:

nautilus

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'craft' is the definition.
(nautilus is a kind of craft)

I cannot understand how the remainder of the clue works.

(Other definitions for nautilus that I've seen before include "Usual tin for a small sea creature" , "Sea creature - literary submarine" , "Spiral-shelled mollusc" , "Creature of deep" , "'Pearly' mollusc" .)

I've seen this clue in The Telegraph.

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