Enjoyment before almost everyone becomes gloomy (8)
I believe the answer is:
funereal
'gloomy' is the definition.
('funereal' can be a synonym of 'gloomy')
'enjoyment before almost everyone' is the wordplay.
'enjoyment' becomes 'fun' (I've seen this before).
'before' becomes 'ere' (usually literary).
'almost' means to remove the last letter (most of the word but not all of it).
'everyone' becomes 'all' (I've seen this before).
'all' with its final letter taken off is 'al'.
'fun'+'ere'+'al'='FUNEREAL'
'becomes' is the link.
(Other definitions for funereal that I've seen before include "Of the ritual of the dead" , "Of sombre character" , "Gloomy" .)