Container for valuables — there’s a fee (just a little) (4)
I believe the answer is:
safe
'container' is the definition.
(safe is a kind of container)
'valuables there's a fee just a little' is the wordplay.
'just a little' indicates the answer is hidden within the clue.
'SAFE' can be found hidden inside 'valuables theres a fee'.
'for' is the link.
(Other definitions for safe that I've seen before include "Strongbox; secure" , "Cash-box" , "Out of harm's way" , "Metal case for storing valuables" , "Secure and free from danger" .)