Clothing a reindeer herder going north carries about (7)
I believe the answer is:
apparel
'clothing' is the definition.
(I know that clothing can be written as apparel)
'a reindeer herder going north carries about' is the wordplay.
'reindeer herder' becomes 'lapp' (I've seen this in another clue).
'going north' says the letters should be written in reverse.
'carries' is an insertion indicator (inserted letters carried inside).
'about' becomes 're' ('re' means regarding or about).
'lapp' reversed gives 'ppal'.
'ppal' going around 're' is 'pparel'.
'a'+'pparel'='APPAREL'
(Other definitions for apparel that I've seen before include "Clothes - garments" , "Raiment" , "Formal word for clothing" , "what's in the press?" , "Fancy gear" .)