I just can't get going on this one, and, to make matters worse, I've written the answer to 17 down in 17 across! I'd feel better if I could get 17 across, which is "Vital energy beginning to let aggressive type relax (5,3)", and starts with a "C" (if I've got 17 across right!) If anyone feels like telling me 12 and/or 21 across, too, that'd be good!