Being advised, he may ramble around the southeast (5)
I believe the answer is:
david
'he may ramble around the southeast' is the definition.
The definition suggests a singular noun which matches the answer.
'being advised' is the wordplay.
'being' becomes 'D.A.' (D.A. is an example).
'advised' becomes 'vid' (I can't justify this - if you can you should give a lot more credence to this answer).
'da'+'vid'='DAVID'
Can you help me to learn more?
(Other definitions for david that I've seen before include "friend of Jonathan's?" , "Man's name" , "Hebrew king" , "Welsh saint - French painter" , "singer/harpist?" .)