Kirky - Another word for 'quite' minus 'hero' (losing a letter in the process) plus H and add another word for 'some'. Definition is 'root'.
The extra letter in 12a is an F. Definition is 'part of a sentence' I have to admit that I have the answer but I can't parse it!
I'm stuck on only one: I have B?S?E? for 10a. Even with the alternative spelling alluded to earlier I still am at a loss with this one...