He'll sing a number with some force! (5)
I believe the answer is:
tenor
This could be a double definition.
'he'll sing a number' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'some force' is the second definition.
(thesaurus)
'with' acts as a link.
Can you help me to learn more?
(Other definitions for tenor that I've seen before include "Pavarotti, for example" , "Male voice of high pitch, like Luciano" , "Meaning - male singing voice" , "character" , "thread" .)