People from Spain and Portugal and Serbia in trouble (8)
I believe the answer is:
iberians
'people from spain and portugal' is the definition.
I know nothing about this answer so I can't tell whether this works.
'serbia in trouble' is the wordplay.
'trouble' indicates anagramming the letters.
'serbia'+'in'='serbiain'
'serbiain' anagrammed gives 'IBERIANS'.
'and' is the link.
Can you help me to learn more?
(Other definitions for iberians that I've seen before include "Inhabitants of peninsula comprising Spain and Portugal" , "People from a peninsular" , "They come from Spain and Portugal" , "People of Spain and Portugal" , "Western Europeans" .)