Crossword Genius

Case in point symbolises this valuable material (8)

Ross

I believe the answer is:

platinum

'this valuable material' is the definition.

'case in point symbolises' is the wordplay.
I cannot really understand how this works, but
'in' is within the answer.
This explanation may well be incorrect...

(Other definitions for platinum that I've seen before include "Precious metal, Pt" , "Heavy white metal" , "1 down, symbol Pt" , "Silver-white precious metal" , "Precious metal; sort of blonde" .)

I've seen this clue in The Independent.
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