Go to sort out mixed-up socks (6)
I believe the answer is:
repair
'go' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for repair that I've seen before include "do some darning" , "Mend, restore to good condition" , "retire" , "Restore to working order" , "Once, return" .)