Vocal rebuke after country's exchanging leaders for health food (5,3)
I believe the answer is:
tiger nut
'vocal rebuke after country's exchanging leaders' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'health food' is the wordplay.
'health' becomes 'tiger' (I can't explain this - if you can you should give a lot more credence to this answer).
'food' becomes 'nut' (type of food).
'tiger'+'nut'='TIGER-NUT'
'for' is the link.
Can you help me to learn more?
(Another definition for tiger nut that I've seen is " something to eat".)