Crossword Genius

True: I'm due to smash an element (9)

Ross

I believe the answer is:

deuterium

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'an element' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe there's an association between them I don't understand?

'true i'm due to smash' is the wordplay.
'to smash' indicates an anagram.
'true'+'im'+'due'='trueimdue'
'trueimdue' with letters rearranged gives 'DEUTERIUM'.

Can you help me to learn more?

I've seen this clue in The Sun.
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