Element, mostly temporary one, we must think (8)

Times Cryptic #28774 | 18 Across | 2023-11-30
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I haven't cracked this one yet — but the brilliant team at Times for the Times have:

No 89 on the list, so a nasty with very limited use, though I gather they’re working on it possibly for radiotherapy. Mostly temporary is ACTIN(g). one is I, and I take UM as “we must think” as in give us some time to think about that.

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