Reminds me of Nico Robin. I pull out my sword and gently wave it to and fro keeping it in your clones sight. I then concentrate on my chakra and send it into the clones system effecting their sense of sight and making them see multiple arms waving around them.
1) This would confuse them but they would be able to break out of it soon since its not very subtle so you would have to act quickly. In answer to your question this genjutsu would momentarily confound them leaving them open for an attack from the real arm, the sword can also be thrown while they are distracted for that short moment.
Can also be combo'ed with Kenjutsu and freeform
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( Genjutsu: Ingemame Ketsugล Sakkaku ) - Illusion Technique String Bean Binding Illusion
Rank: B
Type: Supplementary
Range: Short-Mid
Chakra Cost: 20
Damage points: N/A
Description: Similar to Illusion Technique: Tree Binding Death, where the user first disappears, while the target sees several bean vines growing from the ground. These vines bind the target body, lifting them into the air. Then a bean pod rises from the ground to reveal the user, ready to strike. In reality, the opponent is immobilized by the illusion, allowing the user to strike.
So in this genjutsu, you disappear. While you disappear, the opponent will see bean pods rising around him. These bind him, however the binding starts from the onset of the genjutsu. They just think they can move the whole time. Then you emerge from the ground and kill him.