Show the Queen's occupied it from that day on (4,5)

I believe the answer is:

ever since

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'from that day on' is the definition.
(I've seen this in another clue)

'show the queen's occupied it' is the wordplay.
I cannot really see how this works, but
'queen's' could be 'ers' (abbreviation for Elizabeth Regina) and 'ers' is present in the answer.
'show' could be 'evince' (synonyms) and 'evince' is present in the leftover letters.
No letters remain.
This explanation may well be incorrect...

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