Greek party in charge of suppressing resistance (5)
I believe the answer is:
doric
'greek' is the definition.
(I know that Doric is a type of Ancient Greek)
'party in charge of suppressing resistance' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'in charge of' becomes 'ic'.
'suppressing' indicates putting letters inside.
'resistance' becomes 'r' (electronics abbreviation).
'do'+'ic'='doic'
'doic' placed around 'r' is 'DORIC'.
(Other definitions for doric that I've seen before include "Greek dialect" , "Denoting a classic Greek style" , "One classical order in architecture" , "One of the Greek orders of architecture" , "Type of column" .)