16d) What batsmen do, concerned with some collisions (3-3-3)HIT FOR ??N
23d) Servile types, slaves at first in Arab country (3,3) Y?? ???
24a) Old warship's gone away with everybody on board (7) ??L???
25d) Devon and Cornwall area is hot and smart (5) ????H
27a) Top student's short break in small vehicle (7) ??H????
All help much appreciated