Boundaries batsmen may change (4)
I believe the answer is:
ends
'boundaries' is the definition.
(end is a kind of boundary)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ends that I've seen before include "Destroys" , "Wanting goals" , "Final parts" , "Halts" , "Terminates in dens" .)