Decides cantor should incorporate harmonising melody (7)

I believe the answer is:

descant

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'melody' is the definition.
(descant is a kind of melody)

'decides cantor should incorporate' is the wordplay.
'incorporate' indicates the answer is hidden within the clue (I've seen 'incorporates' mean this).
'DESCANT' is hidden within 'decides cantor should'.

'harmonising' acts as a link.
This may not be correct. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for descant that I've seen before include "Sung variation" , "Upper melody" , "Independent melody sung above a basic melody" , "Accompaniment added above a basic melody" , "Treble melody above the main melody" .)

I've seen this clue in The Irish Times.

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