Yesterday, the Times Crossword featured the clue "Old US scientist bags ore for breaking down (7)". Seasoned solvers of cryptic crosswords will spot that "bags ore" has 7 letters, and that "for breaking down" could reasonably indicate that one should make an anagram from the 7 letters. That leaves the rest of the clue "Old US scientist" as the definition. The answer is Seaborg.
Now, I wouldn't necessarily have thought that Glenn Seaborg was famous enough to feature in a crossword, but with this kind of clue where you have a shortish anagram to work with, it's often the case that you (or at least I) figure out a plausible answer then have to look up to check if you are right. Seaborg was a nuclear physicist or nuclear chemist (them being really the same thing) who worked at University of California, Berkeley, where he was famous for research into making transuranium elements -- those elements heavier than Uranium which are not found in primordial matter, and need to be synthesised in the lab. Element number 106 was named after him, as seaborgium.