Group with vampire over church? (5)
I believe the answer is:
batch
'group' is the definition.
(a batch is a group or set)
'vampire over church?' is the wordplay.
'vampire' becomes 'bat' (vampire bat).
'over' says to put letters next to each other (in a down clue, some letters go over others).
'church?' becomes 'ch' (abbreviation on maps etc).
'bat'+'ch'='BATCH'
'with' is the link.
(Other definitions for batch that I've seen before include "Quantity dealt with at one time" , "Set, collection" , "Collection of items handled together" , "All the loaves baked at the same time" , "Type of loaf" .)