The foreigners send a replacement (5)
I believe the answer is:
danes
'the foreigners' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'send a replacement' is the wordplay.
'replacement' indicates an anagram.
'send'+'a'='senda'
'senda' with letters rearranged gives 'DANES'.
Can you help me to learn more?
(Other definitions for danes that I've seen before include "Vikings" , "Europeans who inhabit Andes" , "E.g. Hamlet and Canute" , "Sedan (anag.)" , "Natives of, eg, Copenhagen" .)