A list is dropped round to the singer (4)
I believe the answer is:
alto
'singer' is the definition.
(type of singing voice)
'a list is dropped round' is the wordplay.
'dropped' suggests deleting specific letters (some letters are excluded or dropped).
'round' becomes 'o' (round can mean a round object).
'list' with 'is' taken away is 'lt'.
'a'+'lt'+'o'='ALTO'
'to the' is the link.
(Other definitions for alto that I've seen before include "Lowest female singing voice" , "A singing voice or pitch" , "One who sings" , "Singer's hidden inside chemical toilet" , "Male singer" .)