Plans to make millions out of sterling! (5)

I believe the answer is:

plots

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'plans' is the definition.
(I know this)

'millions out of sterling' is the wordplay.
'millions' becomes 'pots' (I can't justify this - if you can you should believe this answer much more).
'out of' indicates putting letters inside (some letters on the outside of others).
'sterling' becomes 'l'.
'pots' placed around 'l' is 'PLOTS'.

'to make' acts as a link.

Can you help me to learn more?

(Other definitions for plots that I've seen before include "Conspires" , "Schemes" , "Stories in novels or plays" , "Plans" .)

I've seen this clue in the Evening Standard.

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