Get back engineers’ insurance (7)
I believe the answer is:
recover
'get back' is the definition.
(I've seen this before)
'engineers' insurance' is the wordplay.
'engineers'' becomes 'RE' (abbreviation for Royal Engineers).
'insurance' becomes 'cover' (I've seen this before).
're'+'cover'='RECOVER'
(Other definitions for recover that I've seen before include "Get better - get back" , "Get well again" , "Bring back" , "get fit again" , "Find" .)