Plot devised by Greek character in mother country (11)

'plot' is the definition.
(machination is a kind of plot)

'greek character in mother country' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'in' indicates putting letters inside.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'country' becomes 'nation' (synonyms).
'ma'+'nation'='manation'
'chi' going inside 'manation' is 'MACHINATION'.

'devised by' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?