George:

No Wm. Clark's listed in MS CS Pensions as being a member of the 7th MS.

No Alice Clark's listed in same.

Only one 7th MS member is listed in MS CS Pensions: A Mary Clark filed twice in Covington Co., MS; she said her husband was J.W. Clark of the 7th MS.

The William Clarks who don't have a unit listed and who filed are:

William B. Clark, 1924, Covington County

William H. Clark, 1911, Hinds County

Hope this helps! -- Jim Huffman, Gainesville Vols