Acquire practically unrefined coconut oil source (5)
I believe the answer is:
copra
'coconut oil source' is the definition.
(I've seen this in another clue)
'acquire practically unrefined' is the wordplay.
'acquire' becomes 'cop' (I can't explain this - if you can you should believe this answer much more).
'practically' means to remove the last letter (practically all of the letters).
'unrefined' becomes 'raw' (I've seen this before).
'raw' with its last letter taken off is 'ra'.
'cop'+'ra'='COPRA'
Can you help me to learn more?
(Other definitions for copra that I've seen before include "What gives oil" , "Coconut's kernel" , "Dried cocoa-nut kernels, source of oil" , "Dried coconut kernel" , "Dried coconut-kernel" .)