Completed but glad I didn't start with 1 across..
1ac Crime when cherry, say, is chopped by a boy (7)
I mistakenly filled in crimson - knocking the "e" off crime and adding son - a cherry colour.
1 down Being brassy sort, loose woman removes top (7)
I filled in "crumpet" which fitted with 1 across. Having corrected 1 down to "trumpet" I'm left with T_E_S_N for 1 across Treason? If so I'd love and explanation. Musn't get my strumpets mixed up with crumpet in future.