Insect shouldering leaf in elaborate display (7)
I believe the answer is:
pageant
'elaborate display' is the definition.
(I've seen this before)
'insect shouldering leaf' is the wordplay.
'insect' becomes 'an't' (ant is a kind of insect).
'shouldering' says to put letters next to each other (some letters carry or shoulder others).
'leaf' becomes 'page' (page is a kind of leaf).
'ant' after 'page' is 'PAGEANT'.
'in' is the link.
(Other definitions for pageant that I've seen before include "Costumed procession" , "Show" , "Colourful procession" , "Scene moving" , "Colourful display or parade" .)