Unchaste woman's under control outside (4)
I believe the answer is:
lewd
'unchaste' is the definition.
(thesaurus)
'woman's under control outside' is the wordplay.
'woman' becomes 'W' (abbreviation eg in Woman Police Constable).
'under control' becomes 'led' (I've seen this in other clues).
'outside' indicates putting letters inside.
'w' placed within 'led' is 'LEWD'.
(Other definitions for lewd that I've seen before include "Bawdy" , "Indecent, licentious" , "Smutty" , "Weld in lascivious way" , "Obscene, indecent" .)