Possible Clues:

• Catch on after good moan
• Good to see through what Meldrew does
• Murmur with discontent
• Guest's first evidence of unsettled stomach? Complain
• Complain, be a grouch
• Geriatrician's first to discover the truth about complaint
• Good medic breaks law, generating complaint
• Protest that's good to latch on to
• Moan about investing money in food -- the Parisian style
• Neighbours hiding spirit and the foreign beef