Extent across (5)
I believe the answer is:
width
(Other definitions for width that I've seen before include "Sideways extent" , "Broadness" , "Extent from side to side" , "Lateral extent" , "Thickness" .)
I believe the answer is:
width
(Other definitions for width that I've seen before include "Sideways extent" , "Broadness" , "Extent from side to side" , "Lateral extent" , "Thickness" .)