Too much love for German fellow (4)
I believe the answer is:
otto
'german fellow' is the definition.
(common German name)
'too much love' is the wordplay.
'too much' becomes 'OTT' (short for over the top).
'love' becomes 'o' (love means zero in tennis).
'ott'+'o'='OTTO'
'for' acts as a link.
(Other definitions for otto that I've seen before include "Producer of engines" , "- Preminger, Austrian-born US film producer" , "____ Preminger, US film director born in Austria" , "fragrance comes from?" , "Palindromic fragrance" .)