Talked nonsense with spook in Palladium (8)

I believe the answer is:

prattled

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

'spook in palladium' is the wordplay.
'spook' becomes 'rattle' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'palladium' becomes 'Pd' (Pd is the chemical symbol for palladium).
'rattle' inserted inside 'pd' is 'PRATTLED'.

'with' acts as a link.

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(Other definitions for prattled that I've seen before include "Wittered on" , "Chattered" .)

I've seen this clue in The Independent.

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