Related Clues:

• Be agreeable
• Do some celebrity backing
• Back, as a candidate
• Agree (to)
• Speak in favor of
• Give the thumbs-up
• Give support to
• Give one's backing
• Plug a product, e.g.
• Sign the back
• Sign, in a way
• Formally support, as a candidate
• Give approval to
• Nod, often
• Sign or support