Related Clues:

• Unbending at the back
• This is forbidding one to be in arrear, perhaps
• Forbidding one not to bow on board
• Never bow to the southern bird
• Never bow for this
• No bow for the bird of the South
• Forbidding one to be back there on board
• Strictly speaking, it's not a bow
• 'Never bow for this, strictly speaking (5)'
• Forbidding on board
• Strictly speaking, no bow for one back here
• Not at all lenient
• Point on bird's back
• Hardback?
• Small bird's tail