Not completely straight with lawyers about minister (5)
I believe the answer is:
rabbi
'minister' is the definition.
(I've seen this before)
'not completely straight with lawyers about' is the wordplay.
'not completely straight' becomes 'bi' (bisexual).
'with' means one lot of letters go next to another.
'lawyers' becomes 'bar' (I've seen this before).
'about' says the letters should be written in reverse.
'bar' written backwards gives 'rab'.
'bi' after 'rab' is 'RABBI'.
(Other definitions for rabbi that I've seen before include "A Jewish scholar or synagogue leader" , "Jewish learned man" , "Religious person" , "Religious leader of Jewish congregation" , "Jewish religious teacher" .)