Check uranium has been removed from passage (4)
I believe the answer is:
adit
'passage' is the definition.
(passage leading to a mine)
'check uranium has been removed from' is the wordplay.
'check' becomes 'audit' (I've seen this before).
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'has been removed from' indicates named letters should be taken away.
'audit' with 'u' removed is 'ADIT'.
(Other definitions for adit that I've seen before include "Means of access to mine" , "Da, it is a mine entrance" , "Passageway into a mine" , "Horiz. mine entrance" , "Horizontal mine drainage shaft" .)