Leaf insect: it might be colourful (7)
I believe the answer is:
pageant
'it might be colourful' is the definition.
The definition suggests a singular noun which matches the answer.
'leaf insect' is the wordplay.
'leaf' becomes 'page' (page is a kind of leaf).
'insect' becomes 'an't' (ant is a kind of insect).
'page'+'ant'='PAGEANT'
Can you help me to learn more?
(Other definitions for pageant that I've seen before include "Elaborate procession on historical theme" , "elaborate display" , "Spectacular ceremony" , "Tableaux or dramatic scenes depicting historical events" , "Dramatic performance" .)