#広 is made of #まだれ（广） and ム. 広 used to be an informal variant of 廣. 黃, which is the old form of 黄, serves as the sound indicator of 廣.
広 means spacious and can be pronounced as コウ or ひろ（びろ）.
Did you know all of the words above? They are:
広野（コウヤ）: wide empty plain (can be read as ひろの)
広言（コウゲン）: a big talk, a boast
広義（コウギ）: a broad sense
広告（コウコク）: an advertisement
広（ひろ）い: large, spacious
広（ひろ）がる: spread, extend
広（ひろ）める: make … widely known
広場（ひろば）: a public square, a plaza
広島（ひろしま）: Hiroshima – a city in Japan
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