Skin complaint? Heart has broken! (4,4)
I believe the answer is:
'skin complaint?' is the definition.
(I've seen this before)
'heart has broken' is the wordplay.
'broken' indicates anagramming the letters.
'hearthas' with letters rearranged gives 'HEAT RASH'.
(Other definitions for heat rash that I've seen before include "skin complaint" , "Irritating inflammation of sweat glands" , "Itching of the skin, caused by humid hot weather" .)