German fellow’s delight (4)
I believe the answer is:
glee
'delight' is the definition.
(glee can mean great joy)
'german fellow's' is the wordplay.
'german' becomes 'g' (abbreviation).
'fellow' becomes 'lee' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'g'+'lee'='GLEE'
Can you help me to learn more?
(Other definitions for glee that I've seen before include "Great delight; part song" , "Merriment or gloating" , "Impish enjoyment" , "Joy; part-song" , "Old English part-song" .)