Singer’s selection with less feeling (6)
I believe the answer is:
number
I believe this clue is a double definition.
'singer's selection' is the first definition.
(I've seen this in another clue)
'less feeling' is the second definition.
(more numb)
'with' is the link.
(Other definitions for number that I've seen before include "27, say" , "For example, one" , "Dance" , "Count, musical item" , "theme tune?" .)