Heartache of Tolstoy heroine embracing soldier (6)

I believe the answer is:

angina

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'heartache' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'tolstoy heroine embracing soldier' is the wordplay.
'tolstoy heroine' becomes 'Anna' (Anna Karenina in the Tolstoy book of the same name).
'embracing' indicates putting letters inside.
'soldier' becomes 'GI' (GI can mean a US soldier).
'anna' enclosing 'gi' is 'ANGINA'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for angina that I've seen before include "Painful heart complaint." , "Pain from diseased heart" , "heartfelt complaint?" , "Sudden cardiac pain" , "Sharp chest pain caused by heart disease" .)

I've seen this clue in The Irish Times.

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