My formal style (3)
I believe the answer is:
our
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for our that I've seen before include "Possessed by us" , "Belonging to us" , "Yours and mine" , "''Now is the winter of ... discontent'' (Richard III)" , "'-- House' (Madness song)" .)