Resurrect memories of Unionists admitting terrible greed (6,2)
I believe the answer is:
dredge up
'resurrect memories' is the definition.
'unionists admitting terrible greed' is the wordplay.
'unionists' becomes 'dup' (Democratic Unionist Party).
'admitting' indicates putting letters inside.
'terrible' is an anagram indicator.
'greed' is an anagram of 'redge'.
'dup' enclosing 'redge' is 'DREDGE UP'.
'of' is the link.
(Other definitions for dredge up that I've seen before include "Bring (something unwelcome) to light" , "Bring (something best forgotten) to light" , "raise from bed?" , "Reluctantly recall" , "Bring (something unwelcome) to the attention" .)