Crossword Genius

Second-class silver in sack (3)

Ross

I believe the answer is:

bag

'sack' is the definition.
(I know this)

'second-class silver' is the wordplay.
'second-class' becomes 'b' ().
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'b'+'ag'='BAG'

'in' acts as a link.

(Other definitions for bag that I've seen before include "Secure" , "Claim" , "Carrier" , "Sack" , "The amount of game shot by sportsman" .)

I've seen this clue in The Sun.
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