It's from the laity, this song (3)
I believe the answer is:
lay
'song' is the definition.
(poetic term for a song)
'it's from the laity' is the wordplay.
'from' indicates named letters should be taken away.
'laity' with 'it' taken out is 'LAY'.
'this' is the link.
(Other definitions for lay that I've seen before include "Not ordained; song" , "Of bird, produce egg" , "Air" , "like a minister? On the contrary" , "Set down; song" .)