Behind street, a quiet hiding place (5)
I believe the answer is:
stash
'hiding place' is the definition.
(I've seen this in another clue)
'behind street a quiet' is the wordplay.
'behind' is a charade indicator (letters next to each other).
'street' becomes 'st' (abbreviation).
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'st' next to 'a' is 'sta'.
'sta'+'sh'='STASH'
(Other definitions for stash that I've seen before include "Secret store (colloq.)" , "Treasure trove" , "collection" , "Stow away" , "Consignment of drugs" .)