Literary prizegiver once impressed by denouement of weepie – should that be confined to the bin? (5,5)

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

WHITBREAD(company which once sponsored the Whitbread Book Awards, which were then renamed the Costa Book Awards, then terminated in 20022) containing ( impressed by ) last letter of ( denouement of ) “ weepie “.