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Musical instrument(9) A_ _ _ N _ _ O _
Converts from negative to positive in the dark room (8) _ _ _ E _ EPS
Lively and volatile (9) _ _ _ _ _ R _ A _
Large groups or gangs (6) _ _ _ D _ _
Moves to and fro in waves (6) _ _ R _ E _
Pirate (7) _ _ N _ A _ T
Treachery or deception (6)

Musical instrument(9) ACCORDION?
Converts from negative to positive in the dark room (8)
DEVELOPS?

lively and volatile..... mercurial?

Large groups or gangs (6) hordes?
moves to and fro in waves (6) surges?

deception treachery (6) deceit?

Thanks Rossim, Elle & Ixion for the help