Flat indeed! (8)

I believe the answer is:

deflated

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

'flat' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for deflated that I've seen before include "Let out air or gas from" , "Put down" , "Depressed like punctured balloon" , "Crestfallen" , "Collapsed due to release of gas" .)

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.