Kingdoms about to be given charity (6)
I believe the answer is:
realms
'kingdoms' is the definition.
(I know this)
'about to be given charity' is the wordplay.
'about' becomes 're' (regarding).
'to be given' means one lot of letters go next to another.
'charity' becomes 'alms' (alms is a kind of charity).
're'+'alms'='REALMS'
(Other definitions for realms that I've seen before include "Domains - provinces" , "regions" , "Kingdoms, or fields of activity" , "areas of interest" , "Kingdoms, or fields of interest" .)