Penny and I, with hesitation, going round town that's radioactive (9)

I believe the answer is:

plutonium

(Other definitions for plutonium that I've seen before include "Fuel for nuclear reactors" , "Nuclear material" , "Radioactive element" , "sign of this bomb-making material" , "Radioactive material, Pu" .)

I've seen this clue in The Telegraph.

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