15 down
Book
in
cypher
so
encrypted
for
etailer
(9)
Book in cypher so encrypted for etailer (9)
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The definition is at the end of the clue.
How the clue works
Right, so etailer is the definition here — that's your online shop. Now for the wordplay: take the B (that's the standard abbreviation for Book), and bung it in with the letters of "cypher so", then "encrypted" is telling you to scramble the whole lot together. Shuffle all nine letters and out pops CYBERSHOP.