Crossword Genius

Sheer excess brings a bit of pleasure to a girl (8)

Ross

I believe the answer is:

plethora

I'm a little stuck... Click here to teach me more about this clue!

'sheer excess' is the definition.
'plethora' can be an answer for 'excess' (I've seen this before). I'm not sure about the 'sheer' bit.

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

Can you help me to learn more?

(Other definitions for plethora that I've seen before include "Over-fullness, excess" , "flood" , "Glut, over-abundance" , "opposite of scarcity" , "Superabundance" .)

I've seen this clue in the Evening Standard.
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