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 am not sure about this - if you are sure you should give a lot more credence to this answer).
'out of' is an insertion indicator (some letters on the outside of others).
'sterling' becomes 'l'.
'pots' placed 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" .)