Performers consisting of very slow mover turning up to grab a superior baddie (13)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

V(abbrev. for “very”) + { [ reversal of ( … turning up ) SNAIL(a slow mover, literally and figuratively) containing ( to grab ) [ A + U(letter indicating something superior/upper class) + DEVIL(a baddie/a wicked one) ] }.