Vampire seen with church group? (5)
I believe the answer is:
batch
'group?' is the definition.
'vampire seen with church' is the wordplay.
'vampire' becomes 'bat' (I've seen this in another clue).
'seen with' is a charade indicator (letters next to each other).
'church' becomes 'ch' (common abbreviation).
'bat'+'ch'='BATCH'
(Other definitions for batch that I've seen before include "Production run" , "Group of similar people" , "Set, collection" , "Items produced together" , "All the bread baked at the same time" .)