Roofing material in yonder church (6)
I believe the answer is:
thatch
'roofing material' is the definition.
(I know that thatch is a type of roofing material)
'yonder church' is the wordplay.
'yonder' becomes 'that' (I've seen this in another clue).
'church' becomes 'ch' (common abbreviation).
'that'+'ch'='THATCH'
'in' is the link.
(Other definitions for thatch that I've seen before include "Material used to cover" , "Old-fashioned roofing material" , "Old-fashioned roof covering material" , "unusual roof" , "Old fashioned rural roof covering" .)