Happening at irregular intervals (8)

I believe the answer is:

sporadic

(Other definitions for sporadic that I've seen before include "Occasional - intermittent" , "Occurring infrequently" , "Occurring now and then - cop raids (anag)" , "Picadors being scattered, here and there" , "Occurring at irregular intervals" .)

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

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