Send off to Princess's vegetable garden (8)

I believe the answer is:

dispatch

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'send off' is the definition.
(synonyms)

'princess's vegetable garden' is the wordplay.
'princess's' becomes 'Di's' (Princess Diana).
'vegetable garden' becomes 'patch' (I can't explain this - if you can you should believe this answer much more).
'dis'+'patch'='DISPATCH'

'to' acts as a link.

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(Other definitions for dispatch that I've seen before include "Send off (mail)" , "alacrity" , "Military report (sent in haste?)" , "report I preferred" , "Send promptly; murder" .)

I've seen this clue in the Sydney Morning Herald.

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