Gay parent's elaborate display (9)
I believe the answer is:
pageantry
'display' is the definition.
(I've seen this before)
'gay parent's elaborate' is the wordplay.
'elaborate' is an anagram indicator (an elaborate version of the letters).
'gay'+'parent'='gayparent'
'gayparent' with letters rearranged gives 'PAGEANTRY'.
(Other definitions for pageantry that I've seen before include "Show" , "Spectacle" , "Splendid display" .)