Gold or silver in bulk (7)
I believe the answer is:
bullion
'gold or silver in bulk' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bullion that I've seen before include "Gold or silver in bulk" , "Precious metal in mass" , "Bars of precious metal" , "Gold or silver in bars or ingots" , "expensive bars" .)