Summon soldier for display (7)
I believe the answer is:
pageant
'display' 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' (I've seen this before).
'page'+'ant'='PAGEANT'
'for' is the link.
(Other definitions for pageant that I've seen before include "Dramatic performance" , "Rich parade" , "Series of tableaux etc" , "Parade with tableaux" , "Costumed procession" .)