15a In short, understanding model; 5 letters ID?A? IDEAL but I don't know how?
26a Lawyer concluding love letter 6 letters ???B??
18d faithful feller turned around to face ...E???T...
I'm stuck on 11 across : Obsessive rear admiral seen in one, right? (6) A-O-A- and 12 across : Sound is mostly very slow in music (6) -o-e-t (Could it be Solent?) Any help gratefully received.