Group virtuoso putting out single (5)
I believe the answer is:
genus
'group' is the definition.
(genus is a kind of group)
'virtuoso putting out single' is the wordplay.
'virtuoso' becomes 'genius' ('genius' can be a synonym of 'virtuoso').
'putting out' is a deletion indicator.
'single' becomes 'i' (one).
'genius' with 'i' taken out is 'GENUS'.
(Other definitions for genus that I've seen before include "Category between family and species" , "The Homo of Homo sapiens?" , "Taxonomic grouping" , "Kind or sort of" , "Category above species (Biology)" .)