Bizarre conclusion of game on toxic ground (6)
I believe the answer is:
exotic
'bizarre' is the definition.
(I've seen this before)
'conclusion of game on toxic ground' is the wordplay.
'conclusion of' suggests the final letters.
'on' is a charade indicator (letters next to each other).
'ground' is an anagram indicator ('grind' the letters into a new form).
The final letter of 'game' is 'e'.
'toxic' with letters rearranged gives 'xotic'.
'e'+'xotic'='EXOTIC'
(Other definitions for exotic that I've seen before include "Unusual, foreign" , "Interestingly different or strange" , "Bizarre" , "Unusual and interesting" , "Weird; alien" .)