Serengeti excursion (6)
I believe the answer is:
safari
'serengeti excursion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for safari that I've seen before include "Overland journey to look for wild animals" , "Overland journey by hunters" , "Animal expedition" , "Hunting trip" , "tropical trip" .)