On which notes may be written for workforce (5)
I believe the answer is:
staff
I believe this is a double definition.
'on which notes may be written' is the first definition.
(as in a staff on a musical score)
'for workforce' is the second definition.
(both can mean a group of workers)
(Other definitions for staff that I've seen before include "Emblem of authority" , "Post - office workers" , "something orchestra member may look at" , "Group employed in services etc" , "team?" .)