You can do this for yourself (4)
I believe the answer is:
fend
'you can do this for yourself' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for fend that I've seen before include "Ward off from offender" , "Ward (off); manage (for oneself)" , "Try to manage without help" , "Manage (usually for oneself)" .)