Before each church collection Penny's given olive branch (5,8)
I believe the answer is:
peace offering
'olive branch' is the definition.
(synonyms)
'before each church collection penny's' is the wordplay.
'before' is a charade indicator (letters next to each other).
'each' becomes 'ea' (abbreviation).
'church' becomes 'CE' (abbreviation for Church of England).
'collection' becomes 'offering' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'penny' becomes 'p' (short for pence).
'ea'+'ce'+'offering'='eaceoffering'
'eaceoffering' put after 'p' is 'PEACE-OFFERING'.
'given' acts as a link.
Can you help me to learn more?
(Other definitions for peace offering that I've seen before include "Olive branch" , "Gift offered towards reconciliation" .)