Soldier dropped in from Valparaiso (4)
I believe the answer is:
para
'soldier dropped in' is the definition.
(paratrooper, a soldier dropped into a war zone)
'from valparaiso' is the wordplay.
'from' indicates the answer is hidden within the clue.
'PARA' is hidden within 'valparaiso'.
(Other definitions for para that I've seen before include "Air-drop soldier" , "A block of text; an airborne soldier (abbrs.)" , "Soldier who's dropped in? (abbr)" , "High-jumper" , "Soldier dropping to earth" .)