11 letters Popular expression ... or what the opposite of the answer to each starred clue is? Answer: CATCHPHRASE
11 letters Petrify ... or what five alternating words in 17-, 23-, 29-, 43- and 50-Across can do? Answer: TURNTOSTONE
11 letters Empire State Building locale ... or a hint to three letters in 16-, 19-, 52- and 57-Across Answer: THEBIGAPPLE