Record by tenor included in sequence of songs produced by a number of singers (6)
I believe the answer is:
septet
'songs produced by a number of singers' is the definition.
I can't tell whether this definition defines the answer.
'record by tenor included in sequence' is the wordplay.
'record' becomes 'ep'.
'by' says to put letters next to each other.
'tenor' becomes 't'.
'included in' is an insertion indicator.
'sequence' becomes 'set' (I can't justify this - if you can you should give a lot more credence to this answer).
'ep'+'t'='ept'
'ept' inserted within 'set' is 'SEPTET'.
'of' is the link.
Can you help me to learn more?
(Other definitions for septet that I've seen before include "A set of seven" , "Snow White's companions?" , "Band of seven players" , "Group of seven players" , "Several players" .)