In favour of some deforestation? (3)
I believe the answer is:
for
'in favour of' is the definition.
(I've seen this before)
'some deforestation?' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'FOR' is hidden in the letters of 'deforestation'.
(Other definitions for for that I've seen before include "In support of" , "Approving" , "On behalf of" , "and 16 and 20: Notwithstanding" , "In favour of; since" .)