Reportedly miss big town's laid-back attitude (6)
I believe the answer is:
laxity
'laid-back attitude' is the definition.
(state of being lax or laid-back)
I can't explain the rest of the clue.
(Other definitions for laxity that I've seen before include "Freedom" , "Poor discipline, lack of authority" , "Carelessness or negligence" , "Lack of precision" , "Sloppiness" .)