Occasional lisp or a dicky heart (8)

I believe the answer is:

sporadic

I'm a little stuck... Click here to teach me more about this clue!

'occasional' is the definition.
(I've seen this before)

'lisp or a dicky heart' is the wordplay.
'SPORADIC' is hidden in amongst the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for sporadic that I've seen before include "Occurring infrequently" , "Occurring at irregular intervals" , "Fitful, intermittent" , "Occurring now and then - cop raids (anag)" , "infrequent" .)

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

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