Related Clues:

• Stamps, say
• Approves, for short
• Lets pass
• Allows to proceed
• Lets go through
• Declares acceptable
• Initials, in a way
• They're not forbidding
• Nods, say
• Gives one's approval
• Puts one's initials on
• Gives a thumbs-up sign
• Rubber stamps
• Gives approval to
• Assents, slangily