Store up pickles to order (9)
I believe the answer is:
stockpile
'store up' is the definition.
(I've seen this before)
'pickles to order' is the wordplay.
'order' indicates an anagram.
'pickles'+'to'='picklesto'
'picklesto' with letters rearranged gives 'STOCKPILE'.
(Other definitions for stockpile that I've seen before include "Amass" , "Accumulated goods" , "Store in large quantities" , "Gather" , "Accumulate reserves" .)