Clue 54 - were we thrown off the scent by the redundant words in the clue? "Trendy" = CHIC and "in the past" = AGO. Answer = CHICAGO. "A long time" was not necessary in the clue, and served only to throw solvers off the scent (and I sincerely believe that "proper" cryptic crossword cluers would frown upon this use of redundant words). I started writing this message about 45 seconds "ago" - that is, 45 seconds "in the past"; not, you'll have observed, "45 seconds a long time in the past". There's only so far we can stretch artistic licence....