Clue: Literary man's endless fun, hosting evening of poetry (6)
Answer: JEEVES
Explanation: Literary man's endless fun, hosting evening of poetry (6)
An envelope ('hosting') of EVE ('evening of poetry') in JES[t] ('fun') minus its last letter ('endless'). 'Man' is in the sense of servant, for the valet to Bertie Wooster in P.G. Wodehouse's stories.