Possible Clues:

• Old chap's exclamation
• 'What can ___?'
• Crikey! Hebridean location with no loch
• Beatles "You say goodbye, ___ hello"
• With 39-Across, "Listen up, lads"
• "My word, old chap!"
• 'Here's my two cents ...'
• 'My goodness!'
• 'What ___ goes!' (parent's pronouncement)
• Frequent interjection for Foghorn Leghorn