Get back engineers’ insurance (7)
I believe the answer is:
Here is my best explanation:
'get back' is the definition.
(I've seen this before)
'engineers insurance' is the subsidiary indication.
'engineers' becomes 're' (abbreviation for Royal Engineers).
'insurance' becomes 'cover' (I've seen this before).
(Other definitions for recover that I've seen before include "Get better; retrieve", "Rally, get better", "Get better - get back", "Regain", "Get well again" and "Recuperate".)