Polish nurse embraced by English doctor (5)
I believe the answer is:
emend
'polish' is the definition.
(I've seen this before)
'nurse embraced by english doctor' is the wordplay.
'nurse' becomes 'EN' (abbreviation for enrolled nurse).
'embraced by' is an insertion indicator.
'english' becomes 'E' (abbreviation).
'doctor' becomes 'md' (synonyms).
'e'+'md'='emd'
'en' inserted into 'emd' is 'EMEND'.
(Other definitions for emend that I've seen before include "would appear better" , "get rid of faults" , "Correct and improve the text" , "Make improvements or corrections" , "Alter something written to correct errors" .)