Capacity, ability (7)
I believe the answer is:
faculty
I believe this clue is a double definition.
'capacity' is the first definition.
(thesaurus)
'ability' is the second definition.
(I know that faculty is a type of ability)
(Other definitions for faculty that I've seen before include "Group of university departments" , "Aptitude, talent" , "mental awareness" , "Memory possibly" , "Talent; uni department" .)