11a. Listening aid, achieving best advantage in radio
SPEAKING TRUMPET
12a. Like parish pump, surrounded by water
INSULAR
16a. Broom providing seating when subjected to new spell
GENISTA
6d. Sort of energy making cattle twitch
KINETIC
Is KINE a type of cattle?
13 a. Power- unless it's turned off
LUSTINESS
yes it's an angram, but does LUSTINESS mean POWER? I thought it meant desire or such like.
17a. Nothing to do with the hearing of East African people
NILOTIC
parses for the above please.