Binge eater showing surplus weight (7)

I believe the answer is:

glutton

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'binge eater' is the definition.
'glutton' can be an answer for 'eater' (glutton is a kind of eater). I'm not certain of the 'binge' bit.

'surplus weight' is the wordplay.
'surplus' becomes 'glut' (glut can mean a surplus or surfeit).
'weight' becomes 'ton' (unit of weight).
'glut'+'ton'='GLUTTON'

'showing' is the link.

Can you help me to learn more?

(Other definitions for glutton that I've seen before include "Gourmand" , "Immoderate eater" , "Very greedy eater" , "Greedy type" , "Pig" .)

I've seen this clue in The Daily Express.

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