Possible Clues:

• Though silly, first rate, for example, because it has some point
• Start to be silly, for instance, and very good to get the point of this
• A ship, say, with first-rate weapon
• American bum, say, with top-notch African weapon
• Fool, for example, given first-class weapon
• A sage is breaking up a weapon
• Idiot, say, offered perfect weapon
• It's silly, for instance, all right, to get the point of this (7)
• How silly, for instance, to be first-rate with the spear
• Spear's used say in short attack