Amphibious rodent (6)

I think it could be either:

Which length description are you looking for?:

beaver

(Other definitions for beaver that I've seen before include "Animal with soft fur, builds dams" , "Hard-working furry rodent" , "Semi-aquatic rodent" , "tree-feller" , "Creature that lives in lodge" .)

I've seen this clue in the Evening Standard, The Telegraph and the Sydney Morning Herald.

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