Happiest sort of graveyard inscriptions (8)
I believe the answer is:
epitaphs
'graveyard inscriptions' is the definition.
'epitaphs' can be an answer for 'inscriptions' (epitaph is a kind of inscription). I'm unsure of the 'graveyard' bit.
'happiest sort' is the wordplay.
'sort' indicates anagramming the letters.
'happiest' is an anagram of 'EPITAPHS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for epitaphs that I've seen before include "They're written in memory of people who have died" , "Words written in memory of the dead" , "Happiest (anag)" , "Famous last words" , "words in grave situations" .)