Black community on campus giving something to don for retirement (9)
I believe the answer is:
nightgown
'something to don for retirement' is the definition.
(something donned when going to bed or retiring)
'black community on campus' is the wordplay.
'black' becomes 'night' (I've seen this before).
'community on campus' becomes 'gown' ('town and gown' is local vs student population).
'night'+'gown'='NIGHTGOWN'
'giving' acts as a link.
(Other definitions for nightgown that I've seen before include "Sleep attire" , "Bedtime wear" , "Bedtime attire" , "Garment worn in bed" , "Dress for bed?" .)