Go on - get it! (7)
I believe the answer is:
farther
'go' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for farther that I've seen before include "More distant" , "longer" , "Beyond; her raft (anag)" , "Over a greater distance" .)