Fine crop of hemp, but ravers freak out (6,7)

I believe the answer is:

bumper harvest

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'fine crop of hemp but ravers freak out' is the definition.
I can't judge whether this defines the answer.

'hemp but ravers freak out' is the wordplay.
'freak out' indicates anagramming the letters (I've seen 'freaking out' mean this (I've seen this in other clues)).
'hemp'+'but'+'ravers'='hempbutravers'
'hempbutravers' with letters rearranged gives 'BUMPER HARVEST'.

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

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