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Overweight and maybe apt to splutter? (3)

Ross

I believe the answer is:

fat

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'overweight' is the definition.
(I've seen this before)

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

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(Other definitions for fat that I've seen before include "As Bunter" , "Portly" , "Greasy substance" , "Profitable" , "Excess body weight" .)

I've seen this clue in the Evening Standard.
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