Musical composition from singer, poor kid regularly wearing glasses? (8)
I believe the answer is:
oratorio
'musical composition' is the definition.
(type of musical composition)
'singer poor kid regularly wearing glasses?' is the wordplay.
'singer' becomes 'rat' (I've seen this in other clues).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'wearing' means one lot of letters goes inside another.
'glasses?' becomes 'OO' (OO looks like spectacles).
'poor'+'kid'='poorkid'
The alternating letters of 'poorkid' are 'ori'.
'rat'+'ori'='ratori'
'ratori' inserted inside 'oo' is 'ORATORIO'.
'from' is the link.
(Other definitions for oratorio that I've seen before include "Major choral work" , "Sacred musical piece" , "Large-scale choral work" , "Noted work" , "Large choral work" .)