About to get small signal to save (6)
I believe the answer is:
rescue
'save' is the definition.
(rescuing is a kind of saving)
'about to get small signal' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'to get' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'signal' becomes 'cue' (I've seen this before).
're'+'s'+'cue'='RESCUE'
'to' is the link.
(Other definitions for rescue that I've seen before include "Free someone from trouble" , "delivery" , "Deliver from danger" , "Free from danger or captivity" , "gets one out of a tight corner" .)