German's hindquarters uncovered (4)
I believe the answer is:
otto
'german's' is the definition.
(common German name)
'hindquarters uncovered' is the wordplay.
'hindquarters' becomes 'bottom' (synonyms).
'uncovered' means to look at the middle letters.
The middle of 'bottom' is 'OTTO'.
(Other definitions for otto that I've seen before include "Male German name - a palindrome" , "perfume maker" , "Something essential" , "he goes" , "German emperor" .)