Didn't deny it's a selfish characteristic (6)

I believe the answer is:

agreed

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

'characteristic' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for agreed that I've seen before include "'Concurred, assented (6)'" , "Shared an opinion" , "In harmony" , "granted" , "Said yes" .)

I've seen this clue in The Globe and Mail and The Irish Independent.

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.