Doctor deals with livid rash (3-7)
I believe the answer is:
ill-advised
'rash' is the definition.
(I've seen this before)
'doctor deals with livid' is the wordplay.
'doctor' is an anagram indicator.
'with' means one lot of letters go next to another.
'deals' put after 'livid' is 'lividdeals'.
'lividdeals' with letters rearranged gives 'ILL-ADVISED'.
(Other definitions for ill-advised that I've seen before include "Not prudent" , "Unwise" , "Imprudent" , "Rash" .)