Crossword Genius

In Valparaiso I left some stain (4)

Ross

I believe the answer is:

soil

'some stain' is the definition.
(synonyms)

'in valparaiso i left' is the wordplay.
'in' indicates a hidden word.
'SOIL' is hidden in the letters of 'valparaiso i left'.

(Other definitions for soil that I've seen before include "Dirty - dirt" , "refuse" , "Loose upper layer of earth" , "Earth; make dirty" , "Earth for growing" .)

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