Venom shown by nation over evacuation of Chile (6)
I believe the answer is:
malice
'venom' is the definition.
('malice' can be a synonym of 'venom')
'nation over evacuation of chile' is the wordplay.
'nation' becomes 'mali' (Mali is an example**).
'over' is a charade indicator (letters next to each other).
'evacuation of' suggests removing the centre (the inside letters vacate the word).
'chile' with its centre removed is 'ce'.
'mali'+'ce'='MALICE'
'shown by' is the link.
(Other definitions for malice that I've seen before include "Desire to harm others, may be aforethought" , "Malevolence, spite" , "Hatred" , "Spite and rancour" , "evil intent" .)