Surplus from old church stores cleared out (6)
I believe the answer is:
excess
'surplus' is the definition.
(synonyms)
'old church stores cleared out' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'church' becomes 'CE' (abbreviation for Church of England).
'cleared out' suggests removing the centre.
'stores' with its centre taken out is 'ss'.
'ex'+'ce'+'ss'='EXCESS'
'from' acts as a link.
(Other definitions for excess that I've seen before include "Intemperance" , "Surfeit; overindulgence" , "Glut; surplus" , "Amount that is more than is needed" , "Nothing in it, for the Greeks" .)