Odd bits of Sue's mail in house (4)
I believe the answer is:
semi
'house' is the definition.
(I've seen this before)
'odd bits of sue's mail' is the wordplay.
'odd bits of' means one should take alternating letters.
'sues'+'mail'='suesmail'
The alternate letters of 'suesmail' are 'SEMI'.
'in' is the link.
(Other definitions for semi that I've seen before include "One of two houses with a common wall" , "Prefix meaning half (4)" , "Partly detached home" , "House linked to another" , "House attached to one other" .)