Dismiss puzzle — must pee (5)

I believe the answer is:

stump

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

'dismiss' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.

'puzzle must pee' is the wordplay.
'puzzle' is an anagram indicator.
'pee' becomes 'p'.
'must' with letters rearranged gives 'stum'.
'stum'+'p'='STUMP'

Can you help me to learn more?

(Other definitions for stump that I've seen before include "Nonplus" , "Confound" , "foil" , "Remnant of felled tree" , "Fox" .)

I've seen this clue in The Guardian.

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.