Crossword Genius

Building annex (3)

Ross

I believe the answer is:

ell

'building annex' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ell that I've seen before include "Old unit of length" , "Tailor's measure" , "Old cloth measure" , "railway in Chicago?" , "Old measure of length about 45 inches" .)

I've seen this clue in the Penny Press.
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