Knightly weapon for Percival perhaps? (5)

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

LANCE Percival was a comedian and singer perhaps best known for his calypsos on TW3 and such, despite being born in the very non-Trinidadian Sevenoaks. “Shame and scandal” is a “real” calypso Percival covered rather than one of his often improvised versions.