Wheel of fortune made our detailed epistle (8)
I believe the answer is:
roulette
'wheel of fortune' is the definition.
(I've seen this in another clue)
'our detailed epistle' is the wordplay.
'our' becomes 'rou' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'epistle' becomes 'letter' (I've seen this before).
'letter' with its final letter taken away is 'lette'.
'rou'+'lette'='ROULETTE'
'made' acts as a link.
Can you help me to learn more?
(Other definitions for roulette that I've seen before include "it's for the better, supposedly" , "French gambling" , "Game of chance with small ball" , "Gambling device" , "Gambling game with small ball and revolving disc (8)" .)