Flags where a county lacks employment (5)

I believe the answer is:

wilts

I'm a little stuck... Click here to teach me more about this clue!

'flags' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for wilts that I've seen before include "Droops; county (abbr.)" , "Becomes limp; county" , "A county (abbr.); suffers from 1" , "loses vigour" , "Flags" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app