Member of the clergy in park by hill (6)
I believe the answer is:
rector
'member of the clergy' is the definition.
(I've seen this before)
'park by hill' is the wordplay.
'park' becomes 'rec' (I've seen this in other clues).
'by' means one lot of letters go next to another.
'hill' becomes 'tor' (tor is a kind of hill).
'rec'+'tor'='RECTOR'
'in' is the link.
(Other definitions for rector that I've seen before include "Head of some colleges" , "Vicar" , "Preacher Man" , "Member of the clergy" , "Churchman" .)