Held on to, stored (4)
I believe the answer is:
kept
This clue is a double definition.
'held on to' is the first definition.
('keep' can be a synonym of 'hold on to')
'stored' is the second definition.
(I've seen this in another clue)
(Other definitions for kept that I've seen before include "Maintained, detained" , "Retained possession" , "Retained, held back" , "Saved" , "Looked after" .)