E.g. Menace, Destroyer and Governess, finally on the heels of optimistic bunch? (7)

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

A clue-as-definition?: AS (e.g.) E R S (last or ‘final’ letters of Menace, Destroyer and Governess) after C H (last letters or ‘heels’ of optimistic bunch) – A reference to ‘The Chase’ TV programme