Stockings unusual only in the north and south (6)
I believe the answer is:
nylons
'stockings' is the definition.
(I've seen this before)
'unusual only in the north and south' is the wordplay.
'unusual' indicates an anagram.
'in the' is an insertion indicator.
'north' becomes 'N' (abbreviation).
'and' means one lot of letters go next to another.
'south' becomes 'S' (abbreviation).
'only' anagrammed gives 'ylon'.
'n'+'s'='ns'
'ylon' going inside 'ns' is 'NYLONS'.
(Other definitions for nylons that I've seen before include "Women's stockings made from a sheer material" , "Stockings made of artificial material" , "Clothing" , "Hose" , "Hosiery" .)