Crossword Genius

Building add-on (3)

Ross

I believe the answer is:

ell

'building add-on' 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 "Measure, approx. fourty-five in." , "Tailor's measure" , "Once, forty-five inches" , "approximately 45 inches" , "Old measurement" .)

I've seen this clue in the Universal.
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