Possible Clues:

• Plus sign's cousin
• Q&A part
• A sign 'inders what it's supposed to represent
• I'm through with it on the shore and it's short
• I am through with what's on the seashore & that's that
• Man spared (anag.)
• Pens drama using &
• Character representing 'and'
• It can be shortened and lengthened
• And there's a sign through the grit by the end of the morning