Soldier embraced by Tolstoy heroine with heart problem (6)
I believe the answer is:
angina
'heart problem' is the definition.
(I've seen this in another clue)
'soldier embraced by tolstoy heroine' is the wordplay.
'soldier' becomes 'GI' (term for US soldier).
'embraced by' indicates putting letters inside.
'tolstoy heroine' becomes 'Anna' (Anna Karenina in the Tolstoy book of the same name).
'gi' inserted inside 'anna' is 'ANGINA'.
'with' acts as a link.
(Other definitions for angina that I've seen before include "pain in the neck" , "Heart ailment" , "chest complaint" , "heartfelt complaint?" , "Sudden cardiac pain" .)