Sadly, this one’s clearly the best of a shallow lot:
11 down: (Samuel Langhorne Clemens) 7-down 10-across’s own cat feller (3, 6)
Here, cat = tom, feller = sawyer and you get the rather humorous Samuel Langorne Clemens’s own = Tom Sawyer = cat feller. I thought this was going to be a candidate for DA Bullshit because the y seems to appear from nowhere, but yet again DA teaches me something new and online dictionaries again prove their worth — a sawyer is a person who saws.