Strongly built dog (5)

I believe the answer is:

husky

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'dog' is the definition.
(husky is a kind of dog)

I can't explain the rest of the clue.

(Other definitions for husky that I've seen before include "Slightly hoarse; dog" , "Arctic sled dog" , "sounding a little hoarse" , "Sled-dog" , "Sledge-dog" .)

I've seen this clue in the Evening Standard.

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