Had to resort to autocheck to fill in the final ten squares (KATZ/ZAFTIG was a rough crossing for me, and I didn't know BOFA, ORISON, COUPERIN). I totally should've got CHILLING, BCC and SKI (which was really clever, as was SCALE). Still have no idea what a "brew head" is though. Loved ONTHEMONEY and OFFTHEMARK!
Thanks. By brew head I just meant foam on a beer. Some times I get too cutesy on the clues. When I post this on my blog tomorrow it'll be accompanied by a photo of a foamy glass of beer, which hopefully will make things clearer. (On the blog I usually find some excuse to post a photo from somewhere I've traveled. This particular glass of beer was from a dive restaurant at the top of some rickety stairs overlooking a canal in Amsterdam.)