Something meant to stun soldier in field hospital with a little cut - that hurt (5,4)

'something meant to stun soldier in field' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'hospital with a little cut that hurt' is the wordplay.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'with' is a charade indicator (letters next to each other).
'a little cut' becomes 'magics' (I can't explain this - if you can you should believe this answer much more).
'that hurt' becomes 'ow' (exclamation of pain).
'h' after 'magics' is 'magicsh'.
'magicsh'+'ow'='MAGIC SHOW'

Can you help me to learn more?