Periodic (12)

I believe the answer is:

intermittent

'periodic' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for intermittent that I've seen before include "Occasional" , "On-and-off" , "Occurring irregularly" , "Not continuous or steady" , "Irregular" .)

I've seen this clue in The Mirror and The Independent.

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