Possible Clues:

• — lang syne
• First word in a New Year's song
• & 7 Down Supply UK dealer that is getting capital in the UK
• The type of acquaintance not to be forgotten on New Year's eve?
• Adjective in a seasonal song
• US and England lay in ruins in days of yore
• January 1 song word
• Ageing Glaswegian oddly rejected casual dress at first
• Nostalgic song title word
• Word sung early in the year