Friend from The Gaeltacht welcomes introduction to handbook for some nice party game (8)
I believe the answer is:
charades
'party game' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for charades that I've seen before include "Miming parlour game" , "Games like this" , "Game in which answers are acted out" , "Party guessing game" , "Miming games" .)