Send message for soldier to appear in display (7)
I believe the answer is:
pageant
'display' is the definition.
(thesaurus)
'send message for soldier' is the wordplay.
'send message' becomes 'page' (to contact using a pager).
'for' is a charade indicator (letters next to each other).
'soldier' becomes 'ant' (soldier is a type of ant).
'page'+'ant'='PAGEANT'
'to appear in' is the link.
(Other definitions for pageant that I've seen before include "Scene moving" , "Spectacular parade" , "Show" , "Make public spectacle" , "Magnificent parade" .)