Wild wild Wales in 50s? (7)
I believe the answer is:
lawless
'wild' is the definition.
(I've seen this in another clue)
'wild wales in 50s?' is the wordplay.
'wild' indicates anagramming the letters.
'in' indicates putting letters inside.
'50s?' becomes 'Ls' ('L' can be a synonym of '50').
'wales' anagrammed gives 'awles'.
'awles' inserted into 'ls' is 'LAWLESS'.
(Other definitions for lawless that I've seen before include "disobedient" , "insubordinate" , "Ungoverned" , "Anarchic, without any controls" , "Unruly - anarchic" .)