It's surrounded by my French silver boxes (5)
I believe the answer is:
among
'it's surrounded by' is the definition.
(I've seen this before)
'my french silver boxes' is the wordplay.
'my french' becomes 'mon'.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'boxes' indicates putting letters inside (the outside letters must 'box' inside letters in).
'mon' put into 'ag' is 'AMONG'.
(Other definitions for among that I've seen before include "Amidst" , "In the middle of, say a crowd" , "Amid" , "Included with - inside" , "in a group" .)