Summon soldier for parade (7)
I believe the answer is:
pageant
'for parade' is the definition.
(I've seen this before)
'summon soldier' is the wordplay.
'summon' becomes 'page' (paging is a kind of summoning).
'soldier' becomes 'ant' (soldier ant is a type of ant).
'page'+'ant'='PAGEANT'
(Other definitions for pageant that I've seen before include "Magnificent parade" , "Make public spectacle" , "Elaborate procession on historical theme" , "Costumed procession" , "Dramatic performance" .)