Crook in workforce? (5)
I believe the answer is:
staff
This clue is a double definition.
'crook' is the first definition.
(I've seen this before)
'workforce?' is the second definition.
(both can mean a group of workers)
'in' is the link.
(Other definitions for staff that I've seen before include "Post - office workers" , "teachers possibly used" , "Administrators etc - stick" , "Employees; sceptre" , "Man" .)