Comparatively slender maidens visiting German city (7)
I believe the answer is:
trimmer
'comparatively slender' is the definition.
(I've seen this before)
'maidens visiting german city' is the wordplay.
'maidens' becomes 'mm' (cricket abbreviation for maiden written twice).
'visiting' means one lot of letters goes inside another.
'german city' becomes 'trier' (Trier is a city in Germany).
'mm' placed within 'trier' is 'TRIMMER'.
(Other definitions for trimmer that I've seen before include "One can be cutting" , "who has accommodating views" , "relatively smart" , "in better order for > vicar of Bray?" , "Crew member" .)