Dressed up cellars bringing in touch of hope - no longer this? (10)

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

H <ope> (“touch of” means first letter only) in *(UP CELLARS); “dressed” is anagram indicator; sepulchral means funereal, gloomy, dismal, so no longer describes the atmosphere when the cellars are “dressed up” with “a touch of hope”!