New cartoon accommodates soldier with singing voice (9)
I believe the answer is:
contralto
'singing voice' is the definition.
(contralto is a kind of singing voice)
'new cartoon accommodates soldier' is the wordplay.
'new' indicates an anagram.
'accommodates' is an insertion indicator.
'soldier' becomes 'lt'.
'cartoon' with letters rearranged gives 'contrao'.
'contrao' placed around 'lt' is 'CONTRALTO'.
'with' is the link.
(Other definitions for contralto that I've seen before include "Female voice of the lower register." , "Lowest female singer" , "Singer - not car lot (anag)" , "Lowest female singing voice" , "Low female voice" .)