Crossword Genius

King George I, the day before becoming upset (6)

Ross

I believe the answer is:

grieve

'upset' is the definition.
(to grieve can mean to cause sorrow)

'king george i the day before' is the wordplay.
'king george i' becomes 'GRI' (Georgius Rex - I is first in Roman numerals).
'the day before' becomes 'eve' (I've seen this before).
'gri'+'eve'='GRIEVE'

'becoming' is the link.

(Other definitions for grieve that I've seen before include "Suffer great sorrow" , "Mourn, lament" , "Suffer intense sorrow" , "Mourn, feel sorrow" , "Cause great distress to" .)

I've seen this clue in The Times.
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