Wrong women in a line (4)
I believe the answer is:
awry
'wrong' is the definition.
(synonyms)
'women in a line' is the wordplay.
'women' becomes 'w' (standard abbreviation).
'in' means one lot of letters goes inside another.
'line' becomes 'ry' (abbreviation for railway).
'a'+'ry'='ary'
'w' put into 'ary' is 'AWRY'.
(Other definitions for awry that I've seen before include "'Askew, twisted (4)'" , "out of uniform?" , "Crookedly" , "Distorted, crooked" , "oblique" .)