Supplies workforce to county (6)

I believe the answer is:

staffs

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'supplies' is the definition.
(staffing is a kind of supplying)

'workforce to county' is the wordplay.
'workforce' becomes 'staff' (I've seen this before).
'to county' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'staff'+'s'='STAFFS'

Can you help me to learn more?

(Other definitions for staffs that I've seen before include "Weapons; county (abbr.)" , "West Midlands county (abbrev)" , "County (abbreviation)" , "Employees" , "Where Tamworth is" .)

I've seen this clue in The Independent.

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