Waste processing facility's supported by Yankee group (6)
I believe the answer is:
colony
'group' is the definition.
(eg a group of ants)
'waste processing facility's supported by yankee' is the wordplay.
'waste processing facility' becomes 'col' (I can't justify this - if you can you should give a lot more credence to this answer).
'supported by' becomes 'on' (something on something else is supported by it).
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'col'+'on'+'y'='COLONY'
Can you help me to learn more?
(Other definitions for colony that I've seen before include "Group of organisms of the same type living together" , "Dependency" , "Group of animals or plants living together" , "Overseas settlement" , "New settlement abroad" .)