Now that I'm further down the track with sorting out their complicated lives, it seems that not only did Eli probably have 3 wives (which I'll be coming back to), but his daughter Eleanor and her bridegroom James A. Clark were widowed when they got married:
24 Feb 1886. Married in Alexandria, Virginia. James is 34 (b. 1852 NYC) and Eleanor 30 (b. 1856, Rochester, NY). James' parents' names and Eleanor's father's name is given. Both are shown as widowed.
https://familysearch.org/ark:/61903/1:1:XR7W-S61- then there's the shooting drama (1886), then they have an unnamed child (probably stillbirth) in August 1887, then divorce (1896).
Then Eleanor apparently marries a
Frank Clark, who is named Frank
J. in the 1900 census, a toy salesman, born Oct 1863 in Washington DC, parents born NY. Estimated marriage date 1895:
"United States Census, 1900," database with images, FamilySearch
https://familysearch.org/ark:/61903/1:1:MMFM-HD9.
Then they have a child, Leonard A. Clark (with more history available on him).
Frank is dead by the time of the 1910 Census.
Then Eleanor dies, and on her death record, widowed, her husband is shown as Frank
A. Clark.
Leonard's draft registration record shows his DOB as 21 Feb 1898, but I coudn't spot any birth records, and his Soc. Sec. death record in Jul 1981 doesn't show parents.
It's all a bit peripheral and not terribly important to the main tree, but having a look for Frank reveals an assortment of possibilities in Washington DC, but nothing linking him to Eleanor or to verify whether he's Frank A. or Frank J. Does anyone have a marriage or other record linking a Frank Clark to an Eleanor Clark in Washington DC?