Removed from both entrances at that time (4)
I believe the answer is:
then
'at that time' is the definition.
(synonyms)
'removed from both entrances' is the wordplay.
'removed from' says the answer is hidden in the clue.
'THEN' is hidden in the letters of 'both entrances'.
(Other definitions for then that I've seen before include "Afterwards - as a result" , "soon?" , "Consequently" , "Subsequently - previously" , "At that time; next" .)