Endless delight, of course, making fortune (8)
I believe the answer is:
treasure
'fortune' is the definition.
(I've seen this before)
'endless delight of course' is the wordplay.
'endless' means to remove the last letter.
'delight' becomes 'treat' (I've seen this in another clue).
'of course' becomes 'sure' (I've seen this before).
'treat' with its final letter removed is 'trea'.
'trea'+'sure'='TREASURE'
'making' acts as a link.
(Other definitions for treasure that I've seen before include "' - - Island' novel" , "Highly-prize a possession" , "X marks its spot!" , "... story by R.L. Stevenson" , "Quantity of precious objects" .)