One delivers in French south going about with iron (7)
I believe the answer is:
midwife
'one delivers' is the definition.
(a midwife delivers babies)
'french south going about with iron' is the wordplay.
'french south' becomes 'Midi' (le Midi can refer to the south of France).
'going about' means one lot of letters goes inside another.
'with' becomes 'w' (abbreviation).
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'midi' enclosing 'w' is 'midwi'.
'midwi'+'fe'='MIDWIFE'
'in' is the link.
(Other definitions for midwife that I've seen before include "Delivery woman?" , "Childbirth assister" , "Nurse at birth" , "Delivery worker" , "One assisting with birth" .)