Roll-call response in another environment (4)
I believe the answer is:
here
'roll-call response' is the definition.
(I've seen this in another clue)
'in another environment' is the wordplay.
'in' indicates the answer is hidden within the clue.
'HERE' is hidden in the letters of 'another environment'.
(Other definitions for here that I've seen before include "The present location" , "At this stage" , ""___ be dragons" (old map inscription?)" , "To hand" , "In attendance" .)