Superior nun given directions by a couple of bishops (6)

I believe the answer is:
abbess
'superior nun' is the definition.
(I've seen this before)
'given directions by a couple of bishops' is the wordplay.
'given directions' becomes 'ess' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' says to put letters next to each other.
'couple of bishops' becomes 'BB' (abbreviation for bishop, repeated).
'a'+'bb'='abb'
'ess' after 'abb' is 'ABBESS'.
Can you help me to learn more?
(Other definitions for abbess that I've seen before include "superior to her sisters!" , "Religious leader" , "Person in charge of convent" , "Superior of convent" , "Female superior" .)
