Marley regularly is shocking Scrooge? (5)

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

Anagram (shocking) of alternate letters (regularly) from M [a] R [l] E [y] + IS . For example Ebenezer Scrooge, the miser from A Christmas Carol by Dickens – which also features the ghost of Jacob Marley.