Night before receiving a signal, one gets rescued (7)
I believe the answer is:
evacuee
'one gets rescued' is the definition.
(someone who has been evacuated)
'night before receiving a signal' is the wordplay.
'night before' becomes 'eve' (eve can mean the night before something).
'receiving' indicates putting letters inside.
'signal' becomes 'cue' (as in an actor's cue).
'a'+'cue'='acue'
'eve' going around 'acue' is 'EVACUEE'.
(Other definitions for evacuee that I've seen before include "One moved from place of danger" , "One escaping a war zone" , "one is taken to safety" , "One moved out of a war zone" , "he's delivered" .)