One of the theme answers is HARDBACK and was clued with "Like unabridged print dictionaries". Both parts can precede the word "water." However---and this is me being picky again---the word "hardback" is a misnomer. "Hardbound," referring to a book with hard covers, entered our language in 1926. "Hardback" came along in 1952. Both sides of a hardbound book, and not just the back, have a hard cover. "Paperback" is likewise a misnomer. We all know what the words "paperback" and "hardback" refer to but the words are still inaccurate.
I don't think the puzzle was pedestrian. It can't be easy to find several two-word theme answers where each word can be combined with another word to form a new phrase. In all my puzzle-solving life, I don't think I've seen more than five or six such puzzles. By the way, On The Waterfront won eight Academy Awards, including best picture, best actor (Marlon Brando), best supporting actress (Eva Marie Saint) and best director (Elia Kazan). And sixty years later it becomes a crossword theme. Brando would have been proud.