Name wrong returned soldier in puzzle? (6)
I believe the answer is:
enigma
'puzzle?' is the definition.
(I've seen this before)
'name wrong returned soldier in' is the wordplay.
'wrong' is an anagram indicator.
'returned' shows that the letters should be reversed in order.
'soldier' becomes 'GI' (GI can mean a US soldier).
'in' is an insertion indicator.
'gi' backwards is 'ig'.
'name' with letters rearranged gives 'enma'.
'enma' going around 'ig' is 'ENIGMA'.
(Other definitions for enigma that I've seen before include "German military cipher machine" , "WW2 code" , "Mysterious person/thing" , "Puzzling person/thing" , "Mysterious or puzzling thing" .)