Rate old Boris — and for Macron that’s upsetting

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TEMPO.

Last seen on: The Guardian – Cryptic Crossword No 28,388 – Mar 9 2021

Random information on the term “TEMPO”:

1-Hydroxy-2,2,6,6-tetramethylpiperidine is the organic compound with the formula C5H6Me4NOH (Me = CH3). A white solid, it is classified as a hydroxylamine. The compound has attracted interest as the reduced derivative of the popular radical 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (“TEMPO”). It is a mild base.

TEMPO on Wikipedia