'You'll heed good advice if you're smart' (1,4,2,3,4)
I believe the answer is:
a word to the wise
(Another definition for a word to the wise that I've seen is " some advice".)
I've seen this clue in the Sydney Morning Herald.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.