Lord's servant or house! (5)
I believe the answer is:
manor
'house' is the definition.
(manor is a kind of house)
'lord's servant or' is the wordplay.
I cannot really see how this works, but
'servant' could be 'man' (man is a kind of servant) and 'man' is present in the answer.
'or' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
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" .)