Lord's servant or house! (5)
I believe the answer is:
manor
'house' is the definition.
(manor house is a kind of house)
'lord's servant or' is the wordplay.
I cannot really understand how this works, but
'servant' could be 'man' (man is a kind of servant) and 'man' is found in the answer.
'or' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for manor that I've seen before include "home territory" , "Lord's estate" , "Large country house with lands" , "Roman (anag.)" , "Big house - police district" .)