Speak with another about southern herb (7)
I believe the answer is:
parsley
'herb' is the definition.
(parsley is a kind of herb)
'speak with another about southern' is the wordplay.
'speak with another' becomes 'parley' (I've seen this before).
'about' indicates putting letters inside.
'southern' becomes 's' (abbreviation).
'parley' placed around 's' is 'PARSLEY'.
(Other definitions for parsley that I've seen before include "plant used in cooking" , "Herb with either flat or crinkly leaves" , "Culinary herb" , "Herbal garnish" , "Green plant" .)