Greek character, Nick, almost had one friend in internal affairs (9)
I believe the answer is:
municipal
'greek character nick almost had one friend in internal affairs' is the definition.
I can't tell whether this defines the answer.
'greek character nick almost had one friend' is the wordplay.
'greek character' becomes 'mu' (letter from the Greek alphabet).
'almost' means to remove the last letter (most of the word but not all of it).
'had' means one lot of letters go next to another.
'one' becomes 'I' (Roman numeral).
'friend' becomes 'pal' (pal is a kind of friend).
'nick' with its last letter taken off is 'nic'.
'mu'+'nic'+'i'+'pal'='MUNICIPAL'
Can you help me to learn more?
(Other definitions for municipal that I've seen before include "Borough" , "belonging to the city" , "Run by the council" , "Civic" , "Of local council" .)