It's course is not smooth to find real treasure (8)
I believe the answer is:
truelove
'it's course is not smooth to' is the definition.
I can't tell whether this definition defines the answer.
'real treasure' is the wordplay.
'real' becomes 'true' (similar in meaning).
'treasure' becomes 'love' (I've seen this in another clue).
'true'+'love'='TRUELOVE'
'find' is the link.
Can you help me to learn more?
(Other definitions for truelove that I've seen before include "Sweetheart" , "Quatrefoil" , "Genuine affection?" , "'The course of ... ... ne'er ran smooth'" , "'The course of ..... ne'er runs smooth'" .)