First slice of silverside in a tin should be examined closely (7)
I believe the answer is:
scanned
'examined closely' is the definition.
(I've seen this before)
'first slice of silverside in a tin' is the wordplay.
'first' is a charade indicator (letters next to each other).
'slice of' says to take the initial letters (only a small slice of the word).
'in a tin' becomes 'canned' (I've seen this before).
The initial letter of 'silverside' is 's'.
's'+'canned' is 'SCANNED'.
'should be' is the link.
(Other definitions for scanned that I've seen before include "Thoroughly examined" , "Glanced over" , "given thorough examination" , "examined closely" .)