Greek character devised a plot to acquire a small banger (9)
I believe the answer is:
chipolata
'small banger' is the definition.
'chipolata' can be an answer for 'banger' (I've seen this before). I'm not sure about the 'small' bit.
'greek character devised a plot to acquire a' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'devised' indicates an anagram.
'to acquire' is an insertion indicator.
'a'+'plot'='aplot'
'aplot' is an anagram of 'polat'.
'chi' placed into 'polat' is 'chipolat'.
'chipolat'+'a'='CHIPOLATA'
Can you help me to learn more?
(Other definitions for chipolata that I've seen before include "Party snack" , "Type of sausage" , "Small thin sausage" , "banger" .)