Happiness of German fellow (4)

I believe the answer is:

glee

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'happiness' is the definition.
(glee is a kind of happiness)

'german fellow' is the wordplay.
'german' becomes 'g' (abbreviation).
'fellow' becomes 'lee' (I am not sure about this - if you are sure you should believe this answer much more).
'g'+'lee'='GLEE'

'of' is the link.

Can you help me to learn more?

(Other definitions for glee that I've seen before include "Joy; part-song" , "Unrestrained joy" , "Impish enjoyment" , "Mirth - part-song" , "Old English part-song" .)

I've seen this clue in The Mirror.

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