Fire, finally, to put down large antelope (5)
I believe the answer is:
eland
'large antelope' is the definition.
(I've seen this before)
'fire finally to put down' is the wordplay.
'finally' suggests the final letters.
'to put down' becomes 'land' ('land' can be a synonym of 'put down'**).
The final letter of 'fire' is 'e'.
'e'+'land'='ELAND'
(Other definitions for eland that I've seen before include "Ruminant" , "African beast" , "Antelope seen by Africans" , "One browses in the African plain" , "Led an (anag) -- antelope" .)