Producing plans, relative captures pawn before more valuable piece (9)

'producing plans' is the definition.
I can't judge whether this defines the answer.

'relative captures pawn before more valuable piece' is the wordplay.
'relative' becomes 'mam' (informal term for mother).
'captures' means one lot of letters goes inside another.
'pawn' becomes 'p'.
'before more valuable piece' becomes 'aking' (I can't explain this - if you can you should give a lot more credence to this answer).
'mam' placed around 'p' is 'mapm'.
'mapm'+'aking'='MAPMAKING'

Can you help me to learn more?