Mister Scrooge partook occasionally at first (8)

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

definition: "Mister" as in something that can spray a mist e.g. of perfume Ebenezer "Scrooge" [wiki] is a MISER , with occasional letters from p- A -r- T -o- O -k going first