Related Clues:

• Sign the back of a check
• Overlook or forgive
• Sign the back of a cheque
• Approve or underwrite
• Put one's name to, approve
• Approve, or sign on back of
• Give sanction to
• Give support or approval to
• Approve of, sign on back as of cheque
• Sign back of cheque
• 'Approve of, back (7)'
• 'Excuse, overlook (7)'
• Call this for the war they have on their hands, by the sound of it
• This might look after 15 across
• Just to confirm that that's the last of the last of the horse