An heir dancing gets rupture (6)
I believe the answer is:
hernia
'rupture' is the definition.
(I know that hernia is a type of rupture)
'an heir dancing' is the wordplay.
'dancing' indicates an anagram.
'an'+'heir'='anheir'
'anheir' with letters rearranged gives 'HERNIA'.
'gets' acts as a link.
(Other definitions for hernia that I've seen before include "Rupture in muscle tissue through which a structure protrudes" , "Protrusion of organ through wall of body" , "Protrusion of organ through wall of abdomen, a rupture" , "Rupture, organ penetrating the abdomen" , "Breaking of an organ through its lining" .)