Divided paintings briefly kept in outhouse (6)
I believe the answer is:
shared
'divided' is the definition.
(synonyms)
'paintings briefly kept in outhouse' is the wordplay.
'paintings' becomes 'art' (I've seen this before).
'briefly' means to remove the last letter.
'kept in' indicates putting letters inside.
'outhouse' becomes 'shed' (I've seen this before).
'art' with its last letter taken off is 'ar'.
'ar' inserted inside 'shed' is 'SHARED'.
(Other definitions for shared that I've seen before include "divided into portions" , "Possessed in common" , "Communal" , "Apportioned" , "Participated in" .)