Thus far the lonely heart's desire? (2,4)

I believe the answer is:

to date

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'thus far' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for to date that I've seen before include "Up until today" , "Until this point in time" , "Up to this time - check calendar" , "Reason suitor's come" , "up to the present day" .)

I've seen this clue in The Sun and The Times.

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