Central or Northern Line – and Southern hairstyle (8)

'hairstyle' is the definition.
(I know that cornrows is a hairstyle)

'central or northern line' is the wordplay.
'central' becomes 'c' (common abbreviation in various government acronyms).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'line' becomes 'rows' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'c'+'or'+'n'+'rows'='CORNROWS'

'and southern' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?