Possible Clues:

• Singer, loud, cut short: a time for revenge
• Retaliation as result of change of heart
• Like repayment from PCs, etc, mostly loud with rubbish cladding
• Central parts of Institute reforms dictating payment in kind
• Bird defends soldier's answer to Middle Eastern retaliation
• Repayment in kind of protection given to Barnet
• One way to retaliate