Items robbed from Devon maybe, silver (4)

I believe the answer is:
swag
'items robbed' is the definition.
I can't judge whether this defines the answer.
'devon maybe silver' is the wordplay.
'devon maybe' becomes 'sw' (I can't explain this - if you can you should give a lot more credence to this answer).
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'sw'+'ag'='SWAG'
'from' is the link.
Can you help me to learn more?
(Other definitions for swag that I've seen before include "Burglar's booty" , "goods from burglary" , "Stolen goods" , "Loop of drapery" , "pack of Aussie travellers" .)
