Lying about copper (crooked) raking in millions (9)

I believe the answer is:

recumbent

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'raking in millions' is the definition.
'recumbent' can be an answer for 'raking' (thesaurus). I am not certain of the 'in millions' bit.

'lying about copper crooked' is the wordplay.
'lying' becomes 'rem' (I can't explain this - if you can you should believe this answer much more).
'about' is an insertion indicator.
'copper' becomes 'Cu' (chemical symbol).
'crooked' becomes 'bent' (both can mean corrupt).
'rem' placed around 'cu' is 'recum'.
'recum'+'bent'='RECUMBENT'

Can you help me to learn more?

(Other definitions for recumbent that I've seen before include "flat?" , "Lying down comfortably" .)

I've seen this clue in The Guardian.

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