One's own little drug store (5)
I believe the answer is:
stash
'drug store' is the definition.
(I've seen this before)
'one's own little' is the wordplay.
I cannot really see how this works, but
'one's' could be 'as' (a thing is one thing) and 'as' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stash that I've seen before include "Hide (something) away" , "Treasure trove" , "Squirrel away" , "Secret store of valuables" , "Secret store (colloq.)" .)