Relative, German one over by church (5)
I believe the answer is:
niece
'relative' is the definition.
(type of relative)
'german one over by church' is the wordplay.
'german one' becomes 'ein' (I've seen this in another clue).
'over' shows that the letters should be reversed in order.
'by' is a charade indicator (letters next to each other).
'church' becomes 'CE' (abbreviation for Church of England).
'ein' written backwards gives 'nie'.
'nie'+'ce'='NIECE'
(Other definitions for niece that I've seen before include "Brother's daughter" , "A sibling's child" , "One of the family" , "Family relative" , "A sibling's daughter" .)