Grants wholly over the top in wealthy south (6)
I believe the answer is:
allows
'grants' is the definition.
(I know this)
'wholly over the top in wealthy south' is the wordplay.
'wholly' becomes 'all' (synonyms).
'over' means one lot of letters go next to another (in a down clue, some letters go over others).
'the top in wealthy south' becomes 'ows' (I can't explain this - if you can you should give a lot more credence to this answer).
'all'+'ows'='ALLOWS'
Can you help me to learn more?
(Other definitions for allows that I've seen before include "Grants leave" , "Permits to do something" , "Tolerates" , "Gives permission" , "Sallow (anag.)" .)