How is tree cultivated differently? (9)
I believe the answer is:
otherwise
'differently?' is the definition.
(I know that differently can be written as otherwise)
'how is tree cultivated' is the wordplay.
'cultivated' indicates anagramming the letters.
'how'+'is'+'tree'='howistree'
'howistree' anagrammed gives 'OTHERWISE'.
(Other definitions for otherwise that I've seen before include "Alternatively" , "White rose (anag.)" , "As an alternative - like white rose" , "Under different conditions" , "Apart from that" .)