Go back in to tie one to the other (8)
I believe the answer is:
together
'one to the other' is the definition.
I can't judge whether this definition defines the answer.
'go back in to tie' is the wordplay.
'back' shows that the letters should be reversed in order.
'in' means one lot of letters goes inside another.
'to tie' becomes 'tether' (I've seen this before).
'go' reversed gives 'og'.
'og' inserted within 'tether' is 'TOGETHER'.
Can you help me to learn more?
(Other definitions for together that I've seen before include "Collected" , "Got there (anag.)" , "In conjunction, combined" , "Not apart" , "Well-balanced" .)