Spook in Territorial Army (5)

I believe the answer is:

alarm

'spook' is the definition.
(thesaurus)

'in territorial army' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALARM' can be found hidden inside 'territorial army'.

(Other definitions for alarm that I've seen before include "Deep concern" , "Announcement of danger" , "Distress signal" , "Anxious awareness of danger" , "State of (sudden) fear" .)

I've seen this clue in The Independent.

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