Quaver from end of anthem held by singer (7)
I believe the answer is:
tremble
'quaver' is the definition.
(thesaurus)
'end of anthem held by singer' is the wordplay.
'end of anthem' becomes 'm' (I am not sure about this - if you are sure you should believe this answer much more).
'held by' means one lot of letters goes inside another.
'singer' becomes 'treble' (I've seen this in other clues).
'm' put inside 'treble' is 'TREMBLE'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for tremble that I've seen before include "Quake in one's shoes" , "Show fear" , "Shake with fear or excitement" , "quail" , "Shiver slightly as with cold" .)