Dead tree involved in trickery with others ultimately - ecological disaster (9)

'disaster' is the definition.
(I know that wildfires is a type of great fire)

'dead tree involved in trickery with others ultimately ecological' is the wordplay.
I cannot really see how this works, but
'dead' could be 'd' and 'd' is present in the answer.
'tree' could be 'fir' (fir is a kind of tree) and 'fir' is found in the answer.
'trickery' could be 'wile' (synonyms) and 'wile' is found within the leftover letters.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?