What is referred to by 'a drugmaker zip ref'?

What is associated with: a dropout at age 12 in 1914 he became the most important american landscape photographer of th… Based on the clue 'a drug modeled on snake venom may halve heart atta...', what is the answer? What is referred to by 'a drug store wag'? Based on the clue 'a drug that produces unconsciousness', what is the answer? Based on the clue 'a drum bugle corps contest held annually is calle...', what is the answer? Based on the clue 'a drum machine christened echo helped launch this ...', what is the answer? Based on the clue 'a drummer she brother richard were best known as ...', what is the answer? Based on the clue 'a dry dark beer from guinness or what you might be...', what is the answer?