WI location: BA has to carry mum (7)
I believe the answer is:
bahamas
'wi location' is the definition.
(The Bahamas is part of the West Indies)
'ba has to carry mum' is the wordplay.
'to carry' is an insertion indicator.
'mum' becomes 'ma' (ma can mean mother).
'has' enclosing 'ma' is 'hamas'.
'ba'+'hamas'='BAHAMAS'
(Other definitions for bahamas that I've seen before include "Isles near Florida" , "West Indies inslands" , "WI island group" , "Atlantic islands" , "West Indian country, capital Nassau" .)