Crossword Genius

What jelly rolls are filled with?

Ross

I believe the answer is:

ells

(Other definitions for ells that I've seen before include "Extensions at right angles to the main building" , "Old English lengths" , "Extensions to buildings at right angles: archaic cloth measurements" , "Obsolete units of measurement" , "Cloth measures" .)

I've seen this clue in The New York Times.
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