Norse girl that mostly welcomes soldiers (5)
I believe the answer is:
thora
'norse girl' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'that mostly welcomes soldiers' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'welcomes' is an insertion indicator (in sense of 'invites in').
'soldiers' becomes 'OR' (military abbreviation for other ranks).
'that' with its last letter taken off is 'tha'.
'tha' placed around 'or' is 'THORA'.
Can you help me to learn more?
(Other definitions for thora that I've seen before include "Hat or change for a girl" , "lady" , "Actress, dame, who died in 2003" , "Woman" .)