Wholesale slaughter Republicans recalled with memory (6)
I believe the answer is:
pogrom
'wholesale slaughter' is the definition.
'pogrom' can be an answer for 'slaughter' (I have seen 'Mass slaughter ' mean 'pogrom' so perhaps 'slaughter' could also mean 'pogrom'). I am not sure about the 'wholesale' bit.
'republicans recalled with memory' is the wordplay.
'republicans' becomes 'gop' (the Grand Old Party, nickname for US Republicans).
'recalled' shows that the letters should be reversed in order (to recall can mean to bring something back).
'with' says to put letters next to each other.
'memory' becomes 'ROM' (Read-Only Memory on a computer).
'gop' in reverse letter order is 'pog'.
'pog'+'rom'='POGROM'
Can you help me to learn more?
(Other definitions for pogrom that I've seen before include "Organised massacre of Jews" , "Mass slaughter" , "Racial massacre" , "An organised massacre of a people" , "Organised persecution of an ethnic group" .)