Medical condition has the woman in a mess (6)
I believe the answer is:
hernia
'medical condition' is the definition.
(I know that Hernia is a type of medical condition)
'the woman in a mess' is the wordplay.
'the woman' becomes 'her' ('her' refers to a woman).
'mess' is an anagram indicator.
'in'+'a'='ina'
'ina' with letters rearranged gives 'nia'.
'her'+'nia'='HERNIA'
'has' is the link.
(Other definitions for hernia that I've seen before include "An heir (anag.)" , "Protruding rupture" , "Protrusion of organ through wall of body" , "Rupture, organ penetrating the abdomen" , "Protrusion of organ throung abdinen, rupture" .)