Sing using popular sound (6)
I believe the answer is:
intone
'sing' is the definition.
(intoning is a kind of singing)
'popular sound' is the wordplay.
'popular' becomes 'in'.
'sound' becomes 'tone' (tone is a kind of sound**).
'in'+'tone'='INTONE'
'using' is the link.
(Other definitions for intone that I've seen before include "Recite without inflection" , "Recite with little variation in pitch" , "Speak in chanting voice" , "Recite in a chanting voice" , "Speak in chant or drone" .)