Crossword Genius

'Not guilty'? Hammered chap's imbibed an excess! (8)

Ross

I believe the answer is:

plethora

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'an excess' is the definition.
(plethora is a kind of excess)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for plethora that I've seen before include "'Large, perhaps excessive, amount (8)'" , "opposite of scarcity" , "(A) glut (of something)" , "Large number" , "Profusion" .)

I've seen this clue in The Telegraph.
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