Sad song in Matrix about Neo's Heart (5)

I believe the answer is:

dirge

'sad song' is the definition.
(I've seen this before)

'matrix about neo's heart' is the wordplay.
'matrix' becomes 'grid' (I've seen this before).
'about' is a reversal indicator.
'heart' says to take the centre.
The centre of 'neo' is 'e'.
'grid' reversed gives 'dirg'.
'dirg'+'e'='DIRGE'

'in' is the link.

(Other definitions for dirge that I've seen before include "Mournful music" , "Elegy" , "Melancholy song" , "Funeral hymn" , "Song or hymn of mourning" .)

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

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