I've been trying some of these at thinks.com... ouch ouch ouch. If anyone knows a site with some beginner-level puzzles, I'd appreciate it. :)
Anyway, this one stumped me: React badly when embraced by one scientist or another (14) -- the answer is BACTERIOLOGIST... the definition makes sense, and I understand 'react badly', but how does the rest of it fit?

Oh... I get it now. d'oh.

Answer: CHUCK OUT (or at least, -H-C- OUT). But why?

The OED's 5th definition of "chuck" is food. And if you're 'out' you might have made an error, I guess.

Chuck = 'throw': Out = 'away': 'Chuck = 'food'(e.g. chuck wagon): Out = 'error' (e.g. misalignment) - Looks like a double bubble at a guess?

Don't think so; just 'chuck out' = 'throw away' (single, definitional clue).

Courtesy of the Everyman: Famous Soviet skater in bar accompanied by girl (7). I have R_D_I_A (where the last A might be dubious). Bloody girls' names again. There are, after all, only about three of them...

Yeah rab - we thought it was RODNINA - the first name of a well-known Soviet ice dancer [maybe figure skater] - I think her surname was Tereskova [Sp?]. As you can see, the breakdown of the clue is fairly straightforward.

"Oil is in lots of shiny metal" C-R-S-M (I'm thinking "Chrysom", but I'm not sure)

[Chalky] I have to say Soviet skaters are not my specialist subject, and Google wasn't being very helpful. I'm of the opinion that crosswords should revolve purely around language, rather than "general knowledge" but I seem to be alone in this.

rab] the answer is RODNINA as Chalky says, but it is her surname (Irina Rodnina -3 times olympic Gold Figure Skating) as observed : ROD = bar, NINA = girl.
MF] Answer CHRISOM. lots of shiny metal = chrome (less the E - "lots but not all?") IS is in it. Chrisom is a sacramental oil.