Charm of coat worn by soldier (5)
I believe the answer is:
magic
'charm' is the definition.
(thesaurus)
'coat worn by soldier' is the wordplay.
'coat' becomes 'mac' (mac is a kind of coat).
'worn by' is an insertion indicator (I've seen this in other clues).
'soldier' becomes 'gi' (government issue or general issue).
'mac' enclosing 'gi' is 'MAGIC'.
'of' acts as a link.
(Other definitions for magic that I've seen before include "Enchanting quality" , "Fungus causing trips?" , "Brilliant -- deception" , "Tricks" , "Entertainment at a children's party?" .)