Seasonal worker's dance, a groundbreaker, about to get backing (3-6)

I believe the answer is:

hop-picker

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'dance a groundbreaker about to get backing' is the definition.
I can't tell whether this definition defines the answer.

'seasonal worker's' is the wordplay.
'seasonal' becomes 'hop' (I can't justify this - if you can you should believe this answer much more).
'worker' becomes 'picker' (picker is a kind of worker).
'hop'+'picker'='HOP-PICKER'

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I've seen this clue in The Guardian.

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