Dull, mean, eccentric, grasping, and German (7)
I believe the answer is:
mundane
'dull' is the definition.
(I've seen this before)
'mean eccentric grasping and german' is the wordplay.
'eccentric' indicates an anagram.
'grasping' is an insertion indicator (inserted letters are held or grasped).
'and german' becomes 'und' ('and' in German).
'mean' is an anagram of 'mane'.
'mane' enclosing 'und' is 'MUNDANE'.
(Other definitions for mundane that I've seen before include "Worldly, perhaps dull" , "Unexciting; of this world" , "Earthly; unexciting" , "Everyday, humdrum" , "Banal; earthly" .)