Disturb fellow and female breaking the law (6)
I believe the answer is:
ruffle
'disturb' is the definition.
(thesaurus)
'fellow and female breaking the law' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'and' means one lot of letters go next to another (I've seen this in other clues).
'female' becomes 'f' (abbreviation).
'breaking' is an insertion indicator.
'the law' becomes 'rule' (rule is a kind of law).
'f' put after 'f' is 'ff'.
'ff' going within 'rule' is 'RUFFLE'.
(Other definitions for ruffle that I've seen before include "Disturb or upset, say feathers" , "Dishevel - annoy" , "Cause (feathers) to stand up" , "Agitate" , "Ornamental frill; make disarranged" .)