Stockpile found in California by revolutionary (5)
I believe the answer is:
cache
'stockpile' is the definition.
(I've seen this before)
'california by revolutionary' is the wordplay.
'california' becomes 'ca' (abbreviation).
'by' is a charade indicator (letters next to each other).
'revolutionary' becomes 'che' (Che Guevara).
'ca'+'che'='CACHE'
'found in' is the link.
(Other definitions for cache that I've seen before include "Hiding place for treasure or stores" , "Put away" , "Hidden storage space" , "Hidden storage place" , "Conceal" .)