As is surface of mirror, reflecting shops entered by minister (8)
I believe the answer is:
silvered
'as is surface of mirror' is the definition.
I can't tell whether this defines the answer.
'reflecting shops entered by minister' is the wordplay.
'reflecting' shows that the letters should be reversed in order.
'shops' becomes 'delis' (deli is a kind of shop).
'entered by' indicates putting letters inside (I've seen this in other clues).
'minister' becomes 'rev' (short for reverend).
'delis' enclosing 'rev' is 'derevlis'.
'derevlis' reversed gives 'SILVERED'.
Can you help me to learn more?
(Another definition for silvered that I've seen is " Like posh cutlery".)