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It's always better to give the clue - some solvers here don't get all the papers.
30 A. Unexpectedly find W.C. Boggs & Son? (8,2 words).
NB. This is a thematic crossword. Some clues contain 'a definitional misprint'. The other answers contain letters which are not provided by the wordplay.
I've got Chance On, but that's really because I had an 'a' as the fourth letter and it fitted!