About fifty, getting his kinky enjoyment from (6)
I believe the answer is:
relish
'about fifty getting his kinky enjoyment from' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'about fifty getting his kinky' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'fifty' becomes 'l' (Roman numeral).
'getting' says to put letters next to each other.
'kinky' indicates an anagram.
'his' anagrammed gives 'ish'.
're'+'l'+'ish'='RELISH'
Can you help me to learn more?
(Other definitions for relish that I've seen before include "'Take pleasure in, savour (6)'" , "Savour; chutney" , "Enjoy the highly seasoned sauce" , "love" , "Enthusiastic enjoyment of a condiment" .)