Before “nice,” it’s a verb – after “nice,” it’s a noun Crossword Clue

 The answer to the crossword clue "Before “nice,” it’s a verb – after “nice,” it’s a noun" is BARK.

Before "nice," it's a verb: to BARK (at someone or something)

After "nice," it's a noun: the BARK of a tree

This is a clever clue because it plays on the two different meanings of the word "bark." It is also a good example of a crossword clue that is both challenging and rewarding to solve.