County flags (5)
I believe the answer is:
wilts
This clue is a double definition.
'county' is the first definition.
(short for Wiltshire)
'flags' is the second definition.
(I've seen this in another clue)
(Other definitions for wilts that I've seen before include "Becomes limp; county" , "loses vigour" , "Count[r?]y" , "part of the kingdom" , "(Of foliage) goes limp" .)