To repent after damaging storehouse (8)
I believe the answer is:
entrepot
'storehouse' is the definition.
(I know that storehouse can be written as entrepot)
'to repent after damaging' is the wordplay.
'after damaging' indicates an anagram.
'to'+'repent'='torepent'
'torepent' is an anagram of 'ENTREPOT'.
(Other definitions for entrepot that I've seen before include "Import/export warehouse, port" , "Trading port" , "Storehouse" , "Bonded warehouse; port" .)