This yields oil for a little work in car readjustment (5)
I believe the answer is:
copra
'this yields oil for a little' is the definition.
The definition suggests a singular noun which matches the answer.
'work in car readjustment' is the wordplay.
I cannot quite see how this works, but
'work' could be 'op' (common abbreviation for 'opus') and 'op' is found in the answer.
an anagram of 'car' is 'cra' which is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for copra that I've seen before include "Coconuts provide" , "Coconut's kernel" , "Dried coconut meat" , "Shell offering oil" , "source of oils" .)