Excite uranium in lump to make this (9)

I believe the answer is:

plutonium

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'excite uranium in lump to' is the wordplay.
'excite' is an anagram indicator.
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'u'+'in'+'lump'+'to'='uinlumpto'
'uinlumpto' is an anagram of 'PLUTONIUM'.

'make' acts as a link.

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

I've seen this clue in The Guardian.

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