Eastern European revolutionary goes round with destructive types (7)
I believe the answer is:
vandals
'destructive types' is the definition.
(I've seen this before)
'eastern european revolutionary goes round with' is the wordplay.
'eastern european' becomes 'slav' (I've seen this before).
'revolutionary' is a reversal indicator.
'goes round' means one lot of letters goes inside another.
'with' becomes 'and' (I've seen this before**).
'slav' in reverse letter order is 'vals'.
'vals' going around 'and' is 'VANDALS'.
(Other definitions for vandals that I've seen before include "Destructive types" , "They destroy or deface property" , "Destroyers of the Roman Empire" , "Destructive hooligans" , "they cause destruction" .)