Social occasion where each page is in sexy clothing (3,5)
I believe the answer is:
tea party
'social occasion' is the definition.
(I know that tea party is a type of party)
'each page is in sexy clothing' is the wordplay.
'each' becomes 'ea' (abbreviation).
'page' becomes 'p'.
'is in' is an insertion indicator.
'sexy clothing' becomes 'tarty' (I can't justify this - if you can you should give a lot more credence to this answer).
'ea'+'p'='eap'
'eap' put within 'tarty' is 'TEA-PARTY'.
'where' acts as a link.
Can you help me to learn more?
(Other definitions for tea party that I've seen before include "afternoon get-together" , "American political group" , "Function Alice attended" , "The Mad Hatter's get-together" , "Staunch patriots" .)