Possible Clues:

• Comedy duo in landau Harry led out
• Comedians: one stout, but surely both evergreen?
• When touring old city hear landlady playing a double act
• Comedians in a laundry her lad runs
• Filmdom comedy duo
• 13 down's woman harbouring classy derriere, keeping the nation hot
• Earl had laundry ruined by clownish performers