Plant oddly bound to be mentioned by Kane before departing (7)
I believe the answer is:
rosebud
'be mentioned by kane before departing' is the definition.
I can't judge whether this defines the answer.
'plant oddly bound' is the wordplay.
'plant' becomes 'rose' (I am not sure about this - if you are sure you should believe this answer much more).
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'bound' are 'bud'.
'rose'+'bud'='ROSEBUD'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for rosebud that I've seen before include "Flower not yet open" , "J. Foster Kane's last word" , "bloomer, when tight" , "Young flower - Citizen Kane's last word" , "Partially-opened flower" .)