Supplied from the safe deposit (3)
I believe the answer is:
fed
'supplied' is the definition.
(feeding is a kind of supplying)
'from the safe deposit' is the wordplay.
'from' indicates a hidden word.
'FED' is hidden in the letters of 'safe deposit'.
(Other definitions for fed that I've seen before include "supplied with power?" , "Given sustenance" , "American cop" , "US agent" , "Given food to eat" .)