Porter, solidly built (5)

I believe the answer is:

stout

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'porter' is the definition.
('stout' can be a synonym of 'porter')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stout that I've seen before include "Overweight; porter" , "Full-bodied" , "Fat - strong" , "Rather fat, drink" , "drinks?" .)

I've seen this clue in The Telegraph.

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