Your and my (3)
I believe the answer is:
our
'your and my' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for our that I've seen before include "Relating to us" , "Belonging to us" , "group possession?" , "''Now is the winter of ... discontent'' (Richard III)" , "'-- House' (Madness song)" .)