At a greater distance (7)
(Other definitions for further that I've seen before include "Beyond; also" , "More distant" , "Moreover" , "In addition, also" , "To somewhere more advanced" .)
'at a greater distance' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for farther that I've seen before include "More distant" , "longer" , "Beyond; her raft (anag)" , "Over a greater distance" .)