Walked like a crab (8)

I believe the answer is:

scuttled

(Other definitions for scuttled that I've seen before include "Sank ship by letting water in" , "Ruined - caused to sink" , "Hurried away ignominiously or sank a ship" , "hurried along" , "Deliberately sunk" .)

I've seen this clue in the Sydney Morning Herald.

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