So I’m a bit confused. The expression [[!myTV]] would mean, that you call a snippet with the name myTV to output some data. In this case you could change the snippet to alter the output.
If you meant to write [[*myTV]] and the content of your tv is actually <data value='www.mylink.com'>Description</data>, then you can change it with a custom snippet or a custom output modifier.
Ah, okay. So that’s just the way you’ve set up the values in the TV (or someone that built it before you).
You’re going to need to create a custom snippet to parse that to output only the value I reckon. Perhaps it’s parseable with PHPs DOMDocument? If not, some regex or string manipulation would do the trick so long as your values are consistently formed.
If you’re not too late in the development of the site, I’d also suggest rethinking what you store in the TV values. Perhaps there are better ways to accomplish what you need, but sometimes you gotta work with what you have.
From one of your comments on Stack Overflow it sounds as if the TV only contains the URL. I’m guessing the rest of the data tag is in the template…? But in order to help I think we’d need to see the template code where you’re calling this tv, as well as any other details about this tv.