Crossword Genius

Thick offender having stumbled in seconds (3)

Ross

I believe the answer is:

fat

'thick' is the definition.
(associated in meaning)

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

(Other definitions for fat that I've seen before include "Excess body weight" , "Profitable" , "As Bunter" , "Obese, overweight" , "Cooking grease" .)

I've seen this clue in The Times.
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