Test part of door alarmed (4)
I believe the answer is:
oral
'test' is the definition.
(I've seen this before)
'part of door alarmed' is the wordplay.
'part of' indicates a hidden word.
'ORAL' is hidden in the letters of 'door alarmed'.
(Other definitions for oral that I've seen before include "Relating to the mouth - exam" , "Via the mouth" , "Spoken exam" , "from the trap" , "Spoken, of the mouth" .)