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Infusion from nuclear fission melts away (6)

Ross

I believe the answer is:

clears

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'melts away' is the definition.
The definition and answer can be both related to change as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?

'infusion from nuclear fission' is the wordplay.
'from' indicates named letters should be taken away.
'nuclear'+'fission'='nuclearfission'
'nuclearfission' with 'infusion' removed is 'CLEARS'.

Can you help me to learn more?

(Other definitions for clears that I've seen before include "Empties" , "Exonerates" .)

I've seen this clue in the Irish Times.
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