Plans to make millions out of sterling! (5)
I believe the answer is:
plots
'plans' is the definition.
(plotting is a kind of planning)
'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' is an insertion indicator (some letters on the outside of others).
'sterling' becomes 'l'.
'pots' going around 'l' is 'PLOTS'.
'to make' is the 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" .)