Possible Clues:

• Not getting anywhere hot, lined off with percussion
• Hinted drunk took mature spirits from Down
• Depressed
• Blue equatorial waters here
• He's' old rum stagnating there
• Low-spirited
• Where even matured spirits will not relieve your depression
• Suffering low spirits - becalmed?
• When you're depressed, there's surely some matured spirits to be found there
• Becalmed where there''s matured spirit, it seems