Locks keeping son in clergyman's house (5)
I believe the answer is:
manse
'clergyman's house' is the definition.
(I've seen this in another clue)
'locks keeping son' is the wordplay.
'locks' becomes 'mane' (both can mean hair).
'keeping' is an insertion indicator (some letters kept inside).
'son' becomes 's' (genealogical abbreviation for son).
'mane' going around 's' is 'MANSE'.
'in' is the link.
(Other definitions for manse that I've seen before include "Church minister's house" , "Ecclesiastical residence" , "Minister's quarters" , "Scots minister's house" , "Scottish minister's house" .)