Crossword Genius

Save engineers given second signal (6)

Ross

I believe the answer is:

rescue

'save' is the definition.
(rescuing is a kind of saving)

'engineers given second signal' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'given' is a charade indicator (letters next to each other).
'second' becomes 's' (common abbreviation).
'signal' becomes 'cue' (I've seen this before**).
're'+'s'+'cue'='RESCUE'

(Other definitions for rescue that I've seen before include "Extricate" , "Secure (anag) - release" , "Save someone from a dangerous situation" , "Deliver from danger" , "Free someone from trouble" .)

I've seen this clue in The Telegraph.
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