Possible Clues:

• Using a listening device in church if absolutely necessary
• Move cautiously after a mild strike, if absolutely necessary
• Put a valve in central heating as a last resort
• A light touch, over a short distance if necessary
• Put a bugging device in church if absolutely necessary
• If necessary, move slowly after a knock
• How a little nipper might just manage
• If necessary one might get at this with a little nipper
• Soldiers put in a nick in an emergency
• Nick supports a tax cut if necessary