A great distance covered by safari? (4)
I believe the answer is:
afar
'a great distance' is the definition.
(synonyms)
'covered by safari?' is the wordplay.
'covered by' indicates a hidden word.
'AFAR' is hidden within 'safari'.
(Other definitions for afar that I've seen before include "Many a mile" , "a good way off" , "Way-out" , "Pull out at a distance" , "Many miles away" .)