Admit openly that it's something to take seriously (4)

I believe the answer is:

avow

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

'admit openly' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for avow that I've seen before include "Declare - admit" , "Strongly maintain" , "Asseverate" , "Admit openly" , "Solemnly declare" .)

I've seen this clue in the Evening Standard.

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.