Girl initially owned she has footwear (8)
I believe the answer is:
galoshes
'footwear' is the definition.
(I've seen this before)
'girl initially owned she has' is the wordplay.
'girl' becomes 'gal' ().
'initially' suggests taking the first letters.
'she has' becomes 'shes' (she's).
The initial letter of 'owned' is 'o'.
'gal'+'o'+'shes'='GALOSHES'
(Other definitions for galoshes that I've seen before include "Overshoes usually made of rubber" , "Waterproof overshoes" , "Go hassle to get overshoes" , "footwear" .)