Kept for, when Dorothy's held up again (6)
I believe the answer is:
stored
'kept' is the definition.
(storing is a kind of keeping)
'for when dorothy's held up again' is the wordplay.
I cannot quite understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is present in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stored that I've seen before include "Laid aside for future use" , "Garnered and saved" , "Squirrelled away" , "Put away for future use" , "Kept for future use, as in warehouse" .)