Swine leads huge crowd, hosting a winter celebration (8)
I believe the answer is:
hogmanay
'winter celebration' is the definition.
'swine leads huge crowd hosting a' is the wordplay.
'swine' becomes 'hog' (hog is a kind of swine).
'leads' is a charade indicator (letters next to each other) (some letters go in front of others).
'huge crowd' becomes 'many' (a crowd is made up of many people. I am not sure about the 'huge' bit.).
'hosting' means one lot of letters goes inside another (inserted letters are welcomed in or hosted).
'many' enclosing 'a' is 'manay'.
'hog'+'manay'='HOGMANAY'
Can you help me to learn more?
(Other definitions for hogmanay that I've seen before include "Annual celebration" , "New Year's Eve north of the border" , "New Year's Eve (Scots)" , "New Year's Eve in Scotland" , "New Year up north" .)