European in area south of Nairobi's outskirts poking pig (9)

'european' is the definition.
(I know that Slovenian is a type of european)

'area south of nairobi's outskirts poking pig' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'south of' says to put letters next to each other (in a down clue, some letters go under others).
'outskirts' says to hollow out the word (remove centre letters) (I've seen 'outskirts of' mean this).
'poking' means one lot of letters goes inside another (poke can mean to create a hole in).
'pig' becomes 'sloven' (synonyms).
'nairobi' with its centre taken out is 'ni'.
'a' put after 'ni' is 'nia'.
'nia' placed within 'sloven' is 'SLOVENIAN'.

'in' is the link.