Almost spear a type of antelope (6)
I believe the answer is:
impala
'type of antelope' is the definition.
(impala is a type of antelope)
'almost spear a' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'spear' becomes 'impale' (I've seen this in another clue).
'impale' with its last letter taken off is 'impal'.
'impal'+'a'='IMPALA'
(Other definitions for impala that I've seen before include "Breed of antelope" , "horny type" , "runner and long jumper from Africa" , "One regularly browsing" , "Big game" .)