Exaggerated love for a German (4)
I believe the answer is:
otto
'a german' is the definition.
(I've seen this before)
'exaggerated love' is the wordplay.
'exaggerated' becomes 'ott' (short for 'over the top' - informal British).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'ott'+'o'='OTTO'
'for' acts as a link.
(Other definitions for otto that I've seen before include "- Preminger, Austrian-born US film producer" , "He's a German, whichever way you look at it" , "Ger. name (palindrome)" , "that smells quite nice" , "A man" .)