Large antelope eating plant is in volcanic territory (6,6)
I believe the answer is:
easter island
'volcanic territory' is the definition.
(I've seen this before)
'large antelope eating plant is' is the wordplay.
'large antelope' becomes 'eland' (I've seen this before).
'eating' means one lot of letters goes inside another.
'plant' becomes 'aster'.
'aster'+'is'='asteris'
'eland' going around 'asteris' is 'EASTER ISLAND'.
'in' is the link.
(Other definitions for easter island that I've seen before include "Pacific site of large carvings" , "Pacific site of many monolithic statues" , "Pacific site famous for its monolithic human head statues" , "Pacific spot with large carved heads" , "Pacific location with large carved heads" .)