The party's leadership spill was robust (6)

I believe the answer is:

hearty

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'robust' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for hearty that I've seen before include "Without reservation, satisfying" , "Loudly vigorous and cheerful" , "Stalwart" , "Vigorously warm and friendly" , "Wholesome and substantial, meal say" .)

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

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