Book for music: TS Eliot losing special composition about brother (8)
I believe the answer is:
libretto
'book' is the definition.
(libretto is a kind of book)
'music ts eliot losing special composition about brother' is the wordplay.
I cannot really see how this works, but
'music' could be 'e' and 'e' is found within the answer.
'brother' could be 'br' and 'br' is found within the answer.
This explanation may well be incorrect...
'for' is the link.
Can you help me to learn more?
(Other definitions for libretto that I've seen before include "textbook" , "The words of an opera or musical play" , "11 down book" , "Operatic book" , "Book of words of an opera" .)