Request certain to make for enjoyment (8)
I believe the answer is:
pleasure
'for enjoyment' is the definition.
(I've seen this before)
'request certain' is the wordplay.
'request' becomes 'plea' (plea is a kind of request).
'certain' becomes 'sure' (synonyms).
'plea'+'sure'='PLEASURE'
'to make' acts as a link.
(Other definitions for pleasure that I've seen before include "A very desirable feeling" , "Happy satisfaction" , "amusement" , "Urgent entreaty begins gratification" , "Feeling of enjoyment or satisfaction" .)