Housing arrangement in South Somerset (5)
I believe the answer is:
homes
'housing arrangement' is the definition.
'homes' can be an answer for 'housing' (thesaurus). I am unsure of the 'arrangement' bit.
'in south somerset' is the wordplay.
'in' becomes 'home' ('he's in' can mean 'he's home').
'south somerset' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'home'+'s'='HOMES'
Can you help me to learn more?
(Other definitions for homes that I've seen before include "Dwellings, abodes" , "accommodation" , "Dwelling-places" , "Dwellings, houses" , "Domiciles" .)