Go into tent hosting weird main diversion (13)
I believe the answer is:
entertainment
'diversion' is the definition.
(I know that entertainment is a type of diversion)
'go into tent hosting weird main' is the wordplay.
'go into' becomes 'enter' (enter can mean to go into a place).
'hosting' indicates putting letters inside (inserted letters are welcomed in or hosted).
'weird' is an anagram indicator.
'main' anagrammed gives 'ainm'.
'tent' enclosing 'ainm' is 'tainment'.
'enter'+'tainment'='ENTERTAINMENT'
(Other definitions for entertainment that I've seen before include "Amusement; hospitality" , "Pleasure-giving" , "Source of amusement" , "Diversion for one's leisure time" , "show business" .)