Epitaphs composed for the most fortunate (8)
I believe the answer is:
happiest
'most fortunate' is the definition.
('happy' can be similar in meaning to 'fortunate')
'epitaphs composed' is the wordplay.
'composed' indicates anagramming the letters.
'epitaphs' anagrammed gives 'HAPPIEST'.
'for the' is the link.
(Other definitions for happiest that I've seen before include "Most content" , "Most gay" , "extremely contented" , "Gladdest" , "Most contented and satisfied" .)