What the dog does on disturbing a spy (4)

I believe the answer is:

yaps

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

'what the dog does' is the definition.
The definition suggests a comparative adjective but the answer is not.

'disturbing a spy' is the wordplay.
'disturbing' is an anagram indicator (I've seen this in other clues).
'a'+'spy'='aspy'
'aspy' is an anagram of 'YAPS'.

'on' is the link.

Can you help me to learn more?

(Other definitions for yaps that I've seen before include "Barks" , "shrill sounds" , "Chatters" .)

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.