Support garden excavator (7)
I believe the answer is:
backhoe
'excavator' is the definition.
(backhoe is a kind of excavator)
'support garden' is the wordplay.
'support' becomes 'back' (to back is to support or endorse).
'garden' becomes 'hoe' (to garden could mean to hoe).
'back'+'hoe'='BACKHOE'
I've seen this clue in the Sydney Morning Herald.
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