Mother briefly stores aromatic plant (4)
I believe the answer is:
herb
'aromatic plant' is the definition.
(many herbs are aromatic)
'mother briefly stores' is the wordplay.
'stores' indicates the answer is hidden within the clue.
'HERB' is hidden within 'mother briefly'.
(Other definitions for herb that I've seen before include "Medicinal or culinary plant" , "Parsley, sage, rosemary or thyme?" , "bay perhaps" , "eg Thyme, basil" , "Plant used for flavour" .)