Sudden twinge disturbs dog napping up there (4)
I believe the answer is:
pang
'sudden twinge' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pang that I've seen before include "Sharp pain, of hunger or emotion perhaps" , "Sudden feeling of hunger or pain" , "Sharp pain (or similar feeling)" , "Sudden sharp pain" , "Sudden painful emotion" .)