Containing wildfire is viable and can be confirmed (10)
I believe the answer is:
verifiable
'can be confirmed' is the definition.
I can't judge whether this definition defines the answer.
'containing wildfire is viable' is the wordplay.
'containing' means one lot of letters goes inside another.
'wildfire' becomes 'erif' (I can't explain this - if you can you should give a lot more credence to this answer).
'erif' inserted within 'viable' is 'VERIFIABLE'.
'and' is the link.
Can you help me to learn more?
(Another definition for verifiable that I've seen is " Able to be confirmed".)