Lad excited after Irish girl describes her island home (7)
I believe the answer is:
emerald
'her island home' is the definition.
I can't judge whether this definition defines the answer.
'lad excited after irish girl' is the wordplay.
'excited' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'irish girl' becomes 'Emer' (Irish name).
'lad' is an anagram of 'ald'.
'ald' after 'emer' is 'EMERALD'.
'describes' acts as a link.
Can you help me to learn more?
(Other definitions for emerald that I've seen before include "and 1 Across: Ireland" , "Precious gemstone" , "Highly-valued variety of beryl" , "Gem; type of moth" , "Gem associated with Ireland" .)