Valuable stash (5)
I believe the answer is:
trove
'valuable stash' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trove that I've seen before include "Overt (anag)" , "Overt sort of hidden treasure" , "Treasue ..... is riches found hidden" , "box of delights?" , "Hidden treasure for voter" .)