Landlord perhaps wore pants into which name sewn (5)
I believe the answer is:
owner
'landlord perhaps' is the definition.
(I know that landlord is a type of owner)
'wore pants into which name sewn' is the wordplay.
I cannot really understand how this works, but
'name' could be 'n' (common abbreviation e.g. on forms) and 'n' is found in the answer.
an anagram of 'wore' is 'ower' which is within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for owner that I've seen before include "Legal possessor" , "Person with legal title to something" , "Holder, possessor" , "Keeper" , "Possessor, proprietor" .)