County’s employees, ultimately industrious (6)
I believe the answer is:
staffs
'county's' is the definition.
(Staffordshire)
'employees ultimately industrious' is the wordplay.
'employees' becomes 'staff' (I've seen this before).
'ultimately' says to take the final letters.
The last letter of 'industrious' is 's'.
'staff'+'s'='STAFFS'
(Other definitions for staffs that I've seen before include "provides help for > crooks" , "Poles" , "Provides personnel" , "West Midlands county (abbr)" , "sticks" .)