A list is dropped round to the singer (4)
I believe the answer is:
alto
'the singer' is the definition.
(alto is a kind of singer)
'a list is dropped round' is the wordplay.
'dropped' suggests deleting specific letters.
'round' becomes 'o' (round can mean a round object).
'list' with 'is' taken away is 'lt'.
'a'+'lt'+'o'='ALTO'
'to' acts as a 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" .)