Foreign Republicans recall memory of wholesale slaughter (6)
I believe the answer is:
pogrom
'slaughter' is the definition.
(I have seen 'Mass slaughter ' mean 'pogrom' so perhaps 'slaughter' could also mean 'pogrom')
'foreign republicans recall memory of wholesale' is the wordplay.
I cannot quite understand how this works, but
'memory' could be 'rom' (ROM is an example) and 'rom' is found within the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pogrom that I've seen before include "Organised persecution of an ethnic group" , "Organised massacre of Jews" , "Mass slaughter" , "Racial massacre" , "An organised massacre of a people" .)