Church established and possibly expanded (5)
I believe the answer is:
chest
'and possibly expanded' is the definition.
I can't judge whether this definition defines the answer.
'church established' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'established' becomes 'est' (abbreviated used in shop signs).
'ch'+'est'='CHEST'
Can you help me to learn more?
(Other definitions for chest that I've seen before include "Upper trunk" , "Part of body; storage box" , "Large, sturdy box with a lid" , "Box or trunk" , "Strong box; thorax" .)