Matutinal signal recalling troops caught by everyone (5,4)
I believe the answer is:
alarm call
'matutinal' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'signal recalling troops caught by everyone' is the wordplay.
I cannot quite understand how this works, but
'signal' could be 'alarm' (alarm is a kind of signal) and 'alarm' is found within the answer.
'caught' could be 'c' (cricket abbreviation) and 'c' is present in the answer.
'everyone' could be 'all' (all people) and 'all' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for alarm call that I've seen before include "Robin, maybe, scared to give this" , "hotel service" , "Telephoned awakening" .)