Crossword Genius

Immediately after which our nephew moved (9)

Ross

I believe the answer is:

whereupon

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'immediately after' is the definition.
I can't tell whether this defines the answer.

'our nephew moved' is the wordplay.
'moved' indicates anagramming the letters.
'our'+'nephew'='ournephew'
'ournephew' with letters rearranged gives 'WHEREUPON'.

'which' is the link.

Can you help me to learn more?

(Another definition for whereupon that I've seen is " At which point".)

I've seen this clue in The Daily Express.
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