Finished now - I think - but I still don't understand some. I'm glad other people found this a bit weird.
4D I assume swops 'E' for the 'U' in a pharmacy's business - but what has that/those to do with 'on telephone deposit'?
4D Pharmacy's business stocks ecstacy for you, on telephone deposit (5) D_E_S (won't give the answer unless someone wants it)
Oh, OK, as I was typing in the other two, I saw them. It's Just 4D I don't understand.