I agree, shame when leader's lacking pleasant disposition (7)
I believe the answer is:
amenity
'lacking pleasant disposition' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'i agree shame when leader's' is the wordplay.
I cannot really understand how this works, but
'i' could be 'me' and 'me' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for amenity that I've seen before include "Valued facility" , "Facility serving the public" , "This useful service" , "Useful feature (of place/ building)" , "Feature of place that makes living pleasant and convenient" .)