Engineers do their own version of Get Back (7)
I believe the answer is:
recover
'get back' is the definition.
(I've seen this before)
'engineers do their own version' is the wordplay.
I cannot really see how this works, but
'engineers' could be 're' (Royal Engineers) and 're' is found within the answer.
'version' could be 'cover' (I have seen 'version of number' mean 'cover ' so perhaps 'version' could also mean 'cover ') and 'cover' is located in the answer.
No letters remain.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for recover that I've seen before include "Regain" , "Get better; retrieve" , "Get well again" , "Recuperate" , "get fit again" .)