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Discovered the last item of jewellery submerging (10)

Ross

I believe the answer is:

foundering

'submerging' is the definition.
(thesaurus)

'discovered the last item of jewellery' is the wordplay.
'discovered' becomes 'found' (to discover is to find).
'last' says to take the final letters.
'item of jewellery' becomes 'ring' (ring is a type of jewellery).
The final letter of 'the' is 'e'.
'found'+'e'+'ring'='FOUNDERING'

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