Nick Cook? (5)
I believe the answer is:
poach
This clue might be a double definition.
'nick' is the first definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'cook?' is the second definition.
(I know that poach is a more specific form of the action cook)
Can you help me to learn more?
(Other definitions for poach that I've seen before include "Take game illegally from land or water" , "Track down" , "Appropriate" , "Cook (an egg) in water" , "Cook; hunt illegally" .)