Well, yes, it is easy to understand, but it is not unusual or interesting. And it does not show how bitter Claudio is. So instead, he says: "Give not this rotten orange to your friend"
The "rotten orange" is Hero. Claudio is talking about her as if she is beautiful on the outside but decayed inside - she has turned bad but no-one has seen this yet. Claudio's words are unusual, but the audience can immediately relate to them and remember his ideas. So if you are not too sure of a technique, remove it and compare the two versions - what effect does Shakespeare's technique have on you?
Shakespeare uses imagery a lot in Much Ado About Nothing. Imagery is when we might talk about one thing in terms of another. So Benedick is described as if he were a "disease" which Claudio has caught - he will "hang upon him", make Claudio "mad" and cost a huge amount of money to "be cured". Imagery substitutes one thing for another in three main ways: Similes - when a direct comparison is made (with 'as', 'than' or 'like'). Benedick says he "was duller than a great thaw", while Borachio compares fashion-conscious men to soldiers and priests. These ideas allow us our own interpretations. Is fashion like being in the army and being told what to wear - or everyone looking the same? Metaphors - when one thing is called something else, such as Claudio calling Hero a "jewel". If he had said she is "like a jewel" it would be a simile. But he says she actually is "a jewel", so it is a metaphor. Think about the qualities of a jewel: it is valuable, beautiful and rare. Then think about how Claudio views Hero - is she something to admire and possess, rather than someone to love? Personification - where something is described as if it is human. Beatrice talks about how a "star danced", and Leonato says "happiness takes his