Go six miles? (3)
I believe the answer is:
vim
'go' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'six miles?' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'miles?' becomes 'm' (common abbreviation).
'vi'+'m'='VIM'
Can you help me to learn more?
(Other definitions for vim that I've seen before include "Energy, enthusiasm" , "Pep and energy" , "Exuberant vigour" , "Pep (informal)" , "Liveliness" .)