County's staff returned, ready (6)
I believe the answer is:
dorset
'county's' is the definition.
(I've seen this before)
'staff returned ready' is the wordplay.
'staff' becomes 'rod' (I've seen this before).
'returned' shows that the letters should be reversed in order.
'ready' becomes 'set' ('set' can be similar in meaning to 'ready').
'rod' back-to-front is 'dor'.
'dor'+'set'='DORSET'
(Other definitions for dorset that I've seen before include "Hardy country" , "Rod set up in the English county" , "County of south-west England" , "Sorted out the southern English county" , "South coast county" .)