Crossword Genius

Dropping state viceroy in front of grotto (7)

Ross

I believe the answer is:

sagging

I'm a little stuck... Click here to teach me more about this clue!

'dropping' is the definition.
(sagging is a kind of dropping)

'state viceroy in front of grotto' is the wordplay.
I cannot quite see how this works, but
'in' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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