Crossword Genius

Squat in E London joint: filthy place all round (6)

Ross

I believe the answer is:

stocky

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'squat' is the definition.
(synonyms)

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

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(Other definitions for stocky that I've seen before include "Strongly-built" , "Short and solidly built" , "Heavily built" , "Thickset" , "Heavily-built" .)

I've seen this clue in The Times.
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