Possible Clues:

• Almost expected to feed bagpiper's habit, man always playing?
• Lord half-cut in tartan? Maybe he can't grow up
• Portmanteau for a grown-up who hasn't yet grown up
• Grown-up who's not quite grown up
• Children's and grownups' clothes found around flat mostly
• Lord regressing, into sportswear -- he's in touch with his inner child
• Grown-up who enjoys childish entertainment