A number of men giving voice in concert (5)
I believe the answer is:
tenor
'voice in concert' is the definition.
'a number of men' is the wordplay.
'a number of' becomes 'ten'.
'men' becomes 'or' (I've seen this in other clues**).
'ten'+'or'='TENOR'
'giving' is the link.
(Other definitions for tenor that I've seen before include "Vocal part" , "Male 17" , "General course - male singer" , "thread" , "Male singer with high register" .)