Conjuring for many a soldier to see (5)
I believe the answer is:
magic
'conjuring' is the definition.
(I've seen this before)
'many a soldier to see' is the wordplay.
'many' becomes 'm'.
'soldier' becomes 'gi' (GI can mean a US soldier).
'to see' becomes 'c' (the word for the letter, according to Chambers).
'm'+'a'+'gi'+'c'='MAGIC'
'for' acts as a link.
(Other definitions for magic that I've seen before include "Prestidigitation" , "Witchcraft" , "Enchanting quality" , "Fungus causing trips?" , "Wonderful" .)