Apprehend the kind of phrase that becomes popular (5)

I believe the answer is:

catch

I'm a little stuck... Click here to teach me more about this clue!

'apprehend' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for catch that I've seen before include "Seize - drawback" , "Apprehend - drawback" , "secure" , "Seize hold of" , "Understand" .)

I've seen this clue in The Irish News.

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.